EuroCollider

Extension

Some introduction.

Quickstart

Please check if your audio interface is DC coupled, see EuroCollider: What is a DC coupled interface.

Configure SuperCollider

It may be necessary to start SuperCollider with enough out- and inputs, therefore it is good practice to explicetely set these settings during startup likes.options.device_("Studio 1824c").numOutputBusChannels_(8).numInputBusChannels_(8); s.reboot;

where you need to replace the device with your audio interface. For more information check ServerOptions: *devices and ServerOptions.

Sequence eurorack via Pbind

For detailed instructions see EuroSynth// wiring: audio interface numbers are counted with 0! // module audio output -> audio interface in 6 // audio interface output 4 -> cvIn on module // audio interface output 5 -> trigIn on an envelope generator e = EuroSynth(soundIn: 6, cvOut: 4, gateOut: 5, playMonitor: true).tune; // finish tuning process by following instructions in the post window // start playing a pattern on your eurorack ( Pdef(\myEuroPattern, Pbind( \type, \euro, \euro, e, \dur, 0.25, \degree, Pxrand((0..6), inf), // determines the length of the gate \legato, Pseq([0.8, 0.2], inf), )).play; ) // stop pattern Pdef(\myEuroPattern).stop; // free resources e.clear;

Also check out

• EuroClockIn
• EuroClockOut

for more examples concerning clocks.

Use eurorack modulations in SuperCollider

EuroCollider does not provide an interface to use modulations which originate in the eurorack domain in SuperCollider as this can be achived in various ways in SuperCollider. We want to show here 2 ways how to achive this.

Assuming that you have a LFO wired up to your audio interface input 6 (including 0!)// via ndef Ndef(\euroLFO, {SoundIn.ar(6)}); ( Ndef(\sinOsc, { // AM on SC synth from EuroRack (LF)O var sig = SinOsc.ar([400, 402]) * Ndef(\euroLFO); sig }).play; ) // stop listening Ndef(\sinOsc).clear; // another way: via bus b = Bus.audio(server: s, numChannels: 1); x = {Out.ar(b, SoundIn.ar(6))}.play; ( a = SynthDef(\sinOscEuroMod, {|out| var sig = SinOsc.ar([400, 402]) * \amMod.kr(0.0); Out.ar(out, sig); }).play; ) a.map(\amMod, b); a.free; // in patterns - via ndef Ndef(\euroLFO, {SoundIn.ar(6)}); ( Pdef(\myEuroMod, Pbind( \instrument, \default, \degree, Pxrand((0..5), inf), \dur, 0.5, \pan, Ndef(\euroLFO).asMap, )).play; ) Pdef(\myEuroMod).stop;

Supported audio interfaces

What is a DC coupled interface

DC coupled interface allow to output a DC offset to the output. A list of audio interfaces can be found e.g. here but also include interfaces such as Expert Sleeprs ES-8.

This means that with a DC offset of 0.2 a sine wave would not oscillate between -0.1 and 0.1 but between 0.1 and 0.3, so it does not oscillate around zero as a mean. Some interfaces do not allow to output such a DC offset to protect the loud speakers by adding a high pass filter which removes any offset which could be seen simply as a really slow oscillation.

What if I do not have access to a DC coupled interface?

If the interface is not able to output a steady offset it is still able to output spikes which are gates. You can also use gates or input CVs from your EuroRack module to the input of SuperCollider.

Make sure you have increased the output of your non-DC coupled interface to the maximum, I will use the external headphones jack of my MacBook.s.options.outDevice = "External Headphones"; s.reboot; ( a = SynthDef(\gateTest, { // output a 1 Hz impulse on output 0 Out.ar(0, Impulse.ar(1.0)); }).play; ) a.free;

You should now be able to use gates from SuperCollider with your Eurorack, which also includes EuroClockOut.e = EuroSynth(soundIn: nil, cvOut: nil, gateOut: 0); ( Pdef(\testNonDc, Pbind( \type, \euro, \euro, e, \dur, 0.5, // reduce sustain to make gate shorter \sustain, 0.01, )).play; )

Your interface may not have enough output to trigger something on your modular. In this case try to increase the output of your soundcard.