Coding a Custom Step Sequencer

I have been wanting to code my own customer step sequencer for a while. A couple of weeks ago I finally dived in to the project. I knew I wanted to use a lightweight scripting language for the project an started out with Python. But after trying out a couple of Midi libraries I got frustrated and switched to Ruby with UniMidi.

UniMidi actually works pretty well, and I was able to write a fairly complete 8 track step sequencer for my Novation LaunchPad Mini in about 20 hours. The source code is available on github.  I also made a track where I used this sequencer to control my Volca Sample, and it worked out great.

Last week I decided to take things a bit further and ordered a Novation LaunchControl from Thomann. I figured this controller would be perfect fit for my needs: The silicon pads can be used to mute/unmute the 8 tracks and the 2 x 8 knobs can be set to control volume and pan of the corresponding Volca Sample channels (I’m actually using the right output on the Volca Sample as an effect send, so the pan knob acts as dry/wet balance).

I made another track with this setup and it worked out great… I will be needing a second LaunchControl for my Volca Beats before long. Or maybe I should get hold of some silicon pads and build a more customised midi controller…

I hit some snags with my Ruby/UniMidi setup though. Things work reasonably well as long as I sync to an external clock, but I have not been able to implement a 100% stable internal clock with the Ruby Sleep() function. The internal clock works OK most of the time, but sometimes the tempo drops by maybe 10% for 20 seconds or so… probably because some background task kicks in on my MacBook.

I really want to take this project further and eventually I hope to build a complete sequencer for my hardware setup. While playing around with Ruby and UniMidi has been fun, it is clear to me that I will need another platform to reach this goal.

I initially discounted Max/MSP because I really dislike visual programming languages. I spend my days developing software professionally and I like to write code in a text editor. But after doing some more research, I realised that Max actually has a javascript object and that it is possible to create extensions if you want and this has put me at ease.  At least I will have an alternative to huge canvases with a million visual objects and connections.

I’m still not sure if I want to go with live Max for Live or a “pure” Max setup for this project, but I will be doing some research.

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