Category Archives: Equipment

Korg NTS-1 Editor

Well, the Korg NTS-1 editor is finished! Had to deal with a weird quirk where the randomiser was being triggered by both the note on and note off messages, but I managed to get around that by using the stripnote function which I’ve learnt is perfect for that sort of thing.

It’s available to download from now.

** UPDATE 4th December **
I even got a retweet from Korg USA 🙂

How many projects…

… is too many?

I’ve got lots of things on the go at the moment, so thought I’d take a step back and summarise what I’m up to.

Korg NTS-1 editor

I recently picked up a Korg NTS-1 synth and have had a lot of fun trying out all the user oscillators, particular those from Sinevibes. There are one or two shortcomings, such as the custom controls for the user oscillators not being controllable via MIDI and some audible noise when powering the NTS-1 from my computer. Running on a USB battery pack sorts the latter issue out though I’m pleased to say. And as the user interface is a bit basic, I thought I’d build an editor in MaxforLive.

Korg NTS-1 Editor

I decided to revisit the patch randomiser I coded for my Meeblip Micro editor, but this time, triggering it with incoming MIDI notes. That way, each note will fire off a completely different sound. The seed for the idea came from a twitter post from Finlay Shakespeare, detailing his time working for Novation. The end result is something a bit like the AFX mode on the Novation Bass Station II, but completely random each time as opposed to cycling through presets. Sounds really good – most of the time!

To add some predictability though, you can control which elements are randomised using the toggles. With just cutoff selected, it works a bit like a Sample and Hold.

Still have a bit of work to do, not least to add more elements for randomisation and controls for the effects, but hope to have it available to download in a couple of days. Then I’ll be using it for a 1 synth challenge

Gotek Floppy Emulator

My first sampler was an Akai S2000 and I’ve been meaning to back-up my old sound library for some time now. For years, this was my main sound source and whilst it’s true that nowadays, we’re spoilt with the abundance of gigabyte sample libraries and soft synths, I have fond memories of what I could achieve with much more limited resources at my disposal.

I also know there are some sounds in there from equipment I no longer have, such as the dying EDP Wasp Deluxe that I found dumped outside a neighbours house (true story).

So, I’m going to install a Gotek floppy emulator and back up all my sounds to that. Not exactly sure how to do it yet, but I’m a fast learner!

But, just to be contrary, I’ve also succumbed to the Black Friday sales and bought lots of gigabyte sample libraries including Spitfire Audio’s BBC Core!

Guru Gara Synth Modules

I’ve purchased more PCB’s and Panel’s from Guru Gara Synth and already have a single full voice up and running in my Eurorack system (Oscillator, VCF, VCA and Envelope). Calibration was pretty straightforward and it tracks nicely. I also went with the more expensive CEM3340 reissued chips, as used in the Roland SH101 and MC202, and the oscillator sounds all the better for it!

I have another 2 oscillators and a second envelope to build next as well as a ring modulator.

Orchestral template

Although I’ve been using Ableton for many years now, my sequencer journey started back on Cubase on the Atari ST (That is if you discount the Cheetah SpecDrum module I had with my ZX Spectrum before that). I stayed with Cubase until around version 5, then made the move to Sonic Foundry’s Acid, before finally settling on Ableton.

So why the history lesson on my sequencers? Well, as I’m writing more cinematic stuff at the moment, I thought I’d revisit Cubase 11 and have been really impressed. It’s certainly a different way of working, but it’s amazing how much of it feels familiar too.

One of the main reasons for trying Cubase again was to build up the obligatory orchestral template, and finally make some sense of the various Kontakt sample libraries I’ve bought along the way. It’s a slow, laborious process, and getting the different libraries to play nicely together is a bit of challenge, but it’s strangely rewarding too.

TouchPortal editor

Of course, the downside of a mammoth orchestral template is how you navigate the thing, and this was another factor in choosing Cubase thanks to it’s powerful visibility agents (which I’m not going to even try and explain – lots of head scratching to work those out I can tell you!)

But even then, navigating through menus wasn’t much fun, so I’ve built an editor using TouchPortal that allows me to hide and unhide sections of the template, manage tracks etc. as well as having transport controls. Unlike other similar tools such as Touch OSC or Lemur, it’s a lot more straight forward to program too, although it is at heart, a glorified keyboard emulator. But, it works brilliantly for my purposes and is definitely a good alternative to something like a StreamDeck controller.

Incidentally, I did consider the StreamDeck controller app too, but was put off by the annual subscription for that. Plus, the limitation on 15 buttons.

Anyway, that’s what I’ve been up to. Oh, and I also need to finish my third Meat Beat Manifesto mix tape too. So I better get on, lot’s to do…

Custom MIDI Slider Box Part 2

Thought I’d share a picture of my finished MIDI Slider Box. Really pleased with how it came out considering the limited tools I had access to.

I did initially have a problem with the sliders, but determined the wiper and pos (+) connections were wrong. In the instructions, it shows the wiper as the more central of the two terminals, but in the photos, the wiper is the outside terminal. I switched mine around, and voila, it works perfectly now.

Custom MIDI Slider box

Time for a new project, inspired by this post on Gearslutz. A custom DIY MIDI controller featuring three full size 100mm sliders and based on a Teensy 3.2. This will be used to control MIDI CC’s for my Kontakt libraries.

I sourced components as close as I could to the original post. The Teensy was from Amazon, the sliders and case from Farnell and I’m just waiting for some black 8mm slider knobs from eBay. Was difficult to find 100mm sliders and a case with the right dimensions in the UK so I’ve posted links below.

Bourns B10k Slide Potentiometer
Takachi Plastic Enclosure 30 x 150 x 100

Cost so far is around £50, but I already had some of the components such as LED, USB connector etc. Still quite reasonable though and I’m surprised something like this doesn’t already exist in the market.

Filter update

After some more thorough testing, I determined that the volume of the 3320 VCF was a little on the quiet side, noticeably lower than my other modules. Putting this down to the use of 100k resistors rather than the 91k specified on the circuit board, I decided to replace them and am happy to report this did the trick!

One other interesting thing I noticed is that even with the resonance turned all the way down, and cut-off all the way up, the 3320 VCF does add a little bit of colour to the incoming signal, softening the edges and (dare I use a cliché) making it sound warmer.

Resonance seems to self-oscillate nicely from about 50% onwards and seems pretty easy to tune. There are also optional solder points on the PCB for a 1v/Oct input, so I’ve no doubt it could be quite a capable oscillator too.

All in all, a great addition to my modular synth and looking forward to trying out some other Guru Gara Synth modules in the future!

Pain in the resistors

Well that was a pain in the… resistors.

Finally got the new 3320 VCF module working after tearing my hair out a little. With the lockdown, I’ve had to source the components in dribs and drabs and can’t always get the exact components stated on the circuit board.

About a week ago, I finally took delivery of the last capacitors I needed then excitedly plugged it in and heard… nothing.

A bit of headscratching later, I chanced upon the idea of sending a voltage through the CV input which initially did nothing, until I swept the filter knob, which revealed a comb filter type noise, but only when the knob was pointing straight up. Resonance did nothing to the sound, and I had silence at either end of the filter range.

Where do I start?

My first thought was that perhaps the 100k B potentiometers were faulty, or that I had bought the wrong ones and got my Linear vs Exponentials in a twist. So, I checked stock at and fortunately they had some.

Then, this morning, I had the joy of desoldering the old pots and installing the (arguably superior) new ones. Unfortunately, it didn’t fix the issue.

I checked my soldering again – all looked sound to me – so as a last resort double checked that I’d used the correct resistors. And low and behold, the 91k resistors I had been sent (and which were in a bag labelled 91k) were actually 910k! In fairness, the difference between the two is just a red stripe rather than an orange one, and even my wife wasn’t sure what colour they were when I asked her to check. So I desoldered all four of them, and replaced with 100k resistors (the closest I could find) and I’m pleased to say the module sprung into life.

I still didn’t have any resonance though, but tracked this down to some damage I’d inadvertently caused on the board around one of the resonance knob pins. I could just about work out where the pin was meant to be going though, so added a jumper wire to link to the appropriate resistor, and I have resonance too!

Whether the 100k vs 91k resistors makes a difference to the sound, I’m not really sure, but it sounds good to me and I’m currently enjoying feeding some sample and hold through the CV input.

This was the first time I’d built a module just from a PCB and Panel, rather than a full kit, and it definitely makes me appreciate the convenience a full kit gives you, even if I did save a bit of money along the way.


Today was day one of Ableton‘s #LoopAtHome and they set a challenge to build and record your own ‘Gizmophone’ instrument. Unfortunately, I had urgent gardening to attend to (?) so only managed to hack something together at the last minute, using whatever scrap items I could find. This included an offcut of windowsill, a metal Ikea leg and some old wire I found at the end of the garden. And this is the result…

I did manage to include a Piezo condenser mic too, but it had terrible background hum, so only really worked for short percussive noises which I combined into an Ableton drum kit. I also dialled in a smattering of the Corpus effect to make the sounds ring a little more, but only at 5.5% wet.

Some sounds were actually Ok!

The revelation though was the metal Ikea leg. When tapped with a spanner, it made a high pitched bell tone that was (almost) in tune. I created a patch using Ableton’s sampler instrument, sorted out the tuning then duplicated it with slightly different filter settings before panning each version slightly left and right.

Another technique that worked really well was swirling and scraping the spanner inside the wire springs, which created a lovely rhythmic texture which I layered behind the main percussion sounds. Lots of editing of warp markers in that one, as well as some Beat Repeat to add variation, but really pleased with the end result.

I created a quick demo of my ‘instrument’ so you can hear what it sounds like. Some additional kick, snare and synth bass was added to fill the sound out.

And if you fancy having a look ‘under the bonnet’, I’ve even zipped up the Ableton project folder too!

Gizmophone Project

It only uses stock Ableton plugins, so should work fine (have tested on my Microsoft surface and iMac) – Ozone Elements is on the master channel, but you can just ignore that if you don’t have it installed yourself.

Triple Mantis

Not sure what the plural of Mantis is, but I now have three of the Tip Top Audio cases of the same name, laid out end-to-end on my desk like a mini mission control.

Mission control

Analog Synth Mantis

To the left is the Analog Synth Mantis which is probably the more ‘vanilla’ of the three cases. Built around three different oscillators (OSC303, Tip Top Z3000 and the Doepfer A-110), each with a separate, dedicated filter (VCF303, Intellijel uVCF and Doepfer A-105 respectively), as well as the usual array of VCA’s, ADSR’s and LFO’s (Mainly Doepfer or Erica synths modules).

Dinsync’s excellent Modseq module allows me to do some repeatable Sample and Hold style manipulation of the filter cut-offs, or paired with the Ladik Easy Quantizer module, makes a mean bassline sequencer for the OSC303.

Other modules of note include the FoH Choices joystick, which is paired with the clever little Ladik Joystick Math module which makes it a lot more flexible, and a small selection of Make Noise modules including the Moddemix and LXD which are both great for teasing out plucky, percussive sounds.

Digital & Sequencing Mantis

The middle, Digital & Sequencing Mantis has something of a split personality. The top row provides the master clock for the whole system, which I have distributed between the three cases using a combination of different powered multiples to create a semi-permanent clock backbone.

It also provides additional sequencing and quantizing capabilities, courtesy of a Turing Machine with the Pulses and Voltages expanders and the GMSN Pure Sequencer, both paired with Doepfer A156 Dual Quantizer. These are great when I want something a little more unpredictable than the ES-40 / Ableton Live combination or my Beatstep Pro. Alternatively, the sequencers work great as modulation sources for my percussion modules.

The lower row houses my ‘Digital’ modules, including the obligatory Mutable Instruments trilogy of Braids, Rings and Clouds, as well as Erica synths Black Hole DSP which has some lovely Shimmer effects. A Mutable Music Things ‘Ears’ module rounds things off, used primarily to trigger the strum input of Rings.

Gates & Percussion Mantis

Moving to the right we have the Gates & Percussion Mantis which has a wide variety of drum and percussion modules as well as gate triggers, clock dividers and logic modules which are great for coming up with abstract drum patterns.

The sound sources themselves include the ALM Taiko modules (Still on the lookout for the limited Haswell’s Taiko if one ever comes up on eBay or Muffwiggler), multiple kick drum synths (With the Hexinverter Mutant Bassdrum being a current favourite) and a selection of Tip Top Audio 808 modules.

It’s worth remembering that percussion modules don’t have to be limited to providing drum sounds though, as many have pitch CV inputs which allow you to use them for basslines and tuned percussion alike. They also often have built in VCA’s and envelopes, further increasing their effectiveness for a relatively low cost.

Also in this case are some additional effects courtesy of the Sara VCF filter from DinSync, ALM’s EQ and Music Thing’s Spring reverb module. There’s also a passive ring modulator I made with some germanium diodes which is pretty unique sounding.

And last but not least, we have the Audiodamage ADM09 USB audio interface which is normally linked to an iPad 3 running the stunning Borderlands 2, granular synthesis app. You can coax some amazing sounds out of Borderlands, particularly when feeding it a diet of modular synth noises from the ADM09.

One day, I might even learn what it all does 🙂 Seriously though, I’ve just signed up to the Learning Modular Patreon page which gives regular hints and tips on how to get the most out of your modular synth, as well as free access to a course of your choice on the main Learning Modular site. Can’t be bad!

I’d hope I’m comfortable with the basics, so went with the ‘Level 2 Eurorack expansion’ which is very comprehensive and appears to be regularly updated to keep it current. Chris Meyer who created and presents the course has a great knack of making complex concepts sound easy and I’m learning so much already. Here’s an excerpt from the course…

The only danger is that I’m now lusting after a Mordax Data module, having seen Chris demonstrate his one. I’m sure I can make it fit somewhere 🙂

3320 Filter module

Well, this house building business takes a lot more time than I had expected, and whilst I’ve become something of a dab hand at building airing cupboards and fitting out utility rooms, I’m finally coming out of the other side and getting a bit of time to work on my music.

I’ve recently taken delivery of a third Mantis case (someone should have told me this Eurorack hobby would turn into an obsession!) and am working out what modules to put into the gaps.

DIY time

As you can never have enough filters, I decided to go DIY and search for something interesting for the last 8HP of the ‘Analogue Synth’ Mantis case.

This led me to a PCB and Panel kit by Guru Gara Synth, based around the 4-pole 24dB CEM 3320 filter. The filter was used in lots of classic 80’s music technology including most notably the Prophet 5 synth (Rev. 3), the Fairlight II, PPG Wave 2 and the Oberheim OB-SX – none of which I would ever expect to be able to own! (Unless Behringer feels like cloning them of course).

The kit doesn’t come with any build instructions, but the PCB is very clearly laid out, so that’s no biggie. As the CEM3320 has been out of production for some time now, I went for the AS3320 from which is a modern equivalent and very reasonably priced. From the YouTube videos, it does sound rather nice!

More info on the 3 Mantis cases themselves and how I’ve configured them in a future post.

Pedal Board Project

I don’t often use guitar pedals, but they are good for creatively messing up the ‘clean’ sounds from my synths. It was always a bit of a hassle setting them up though, and as you know I like a project, so I put together a basic pedal board. All fairly standard stuff, but I introduced a mini mixer in the chain so that I can mix the wet and dry signals from the delay. It also allows me to create some feedback loops by using output B from the reverb and putting it into Input 3 on the mixer.

My requirements were also that they should be powered off of a single plug. The pedals were straightforward in that regard, but the mixer used 12v rather than the 9v pedal’s typical need.

The solution came in the form of the Donner DP-2 Guitar Pedal Power Supply, which has 10 outputs including one at 12v. The included power lead didn’t fit the socket of the mixer though, and I also needed to invert the polarity too, so had to invest in a couple of adapters which did the trick!

Some cable ties helped to control the rat’s nest of wires underneath and I added some castors too. Originally, there were 4 castors, but I decided to remove 2 of them so the board tilts at a nice angle.

The photos look a little wonky, but that’s just the angle of the photo – they are square, honest!