Norns Engine Development on MacOS - quick guide

!norns_on_mac.md

1. Pull the norns repository

2. Make symbolic links from norns sc folders -> SuperCollider Extensions folder:

   • ln -s ~/development/github/monome/norns/sc/core ~/Library/Application\ Support/SuperCollider/Extensions/monome-norns-core
   • ln -s ~/development/github/monome/norns/sc/engines ~/Library/Application\ Support/SuperCollider/Extensions/monome-norns-engines
   • ln -s ~/development/github/monome/norns/sc/ugens ~/Library/Application\ Support/SuperCollider/Extensions/monome-norns-ugens

3. Make symlinks to Norns community repos e.g. ln -s ~/development/github/monome/we/ ~/Library/Application\ Support/SuperCollider/Extensions/monome-we

4. Make symlinks for custom engine development e.g. ln -s ~/development/custom-norns-dev/ ~/Library/Application\ Support/SuperCollider/Extensions/custom-norns-dev

5. If you're running Jack on MacOS, you will want to comment out lines related to Jack connection in Crone.sc

engine_development_example.scd

// thanks to @zebra: https://llllllll.co/t/norns-crone-supercollider/14616/129?u=mimetaur

n = NetAddr.localAddr;

n.sendMsg('/engine/load/name', 'PolyPercPannable');

// equivalently:
// Crone.setEngine('Engine_PolyPercPannable')

n.sendMsg('/command/hz', 330);
n.sendMsg('/command/amp', 0.5);

Engine_PolyPercPannable.sc

// CroneEngine_PolyPercPannable
// sine with perc envelopes triggered on freq
// panning added
// make sure this lives on your SC include paths
// by @mimetaur

Engine_PolyPercPannable : CroneEngine {
	var pg;
    var amp=0.3;
    var release=0.5;
    var pw=0.5;
    var cutoff=1000;
    var gain=2;
	var pan=0;

	*new { arg context, doneCallback;
		^super.new(context, doneCallback);
	}

	alloc {
		pg = ParGroup.tail(context.xg);
        SynthDef("PolyPerc", {
			arg out, freq = 440, pw=pw, amp=amp, cutoff=cutoff, gain=gain, release=release, pan=pan;
			var snd = Pulse.ar(freq, pw);
			var filt = MoogFF.ar(snd,cutoff,gain);
			var env = Env.perc(level: amp, releaseTime: release).kr(2);
			//			out.poll;

			Out.ar(out, Pan2.ar( (filt * env), pan));
		}).add;

		this.addCommand("hz", "f", { arg msg;
			var val = msg[1];
            Synth("PolyPerc", [\out, context.out_b, \freq,val,\pw,pw,\amp,amp,\cutoff,cutoff,\gain,gain,\release,release,\pan,pan], target:pg);
		});

		this.addCommand("amp", "f", { arg msg;
			amp = msg[1];
		});

		this.addCommand("pw", "f", { arg msg;
			pw = msg[1];
		});
		this.addCommand("release", "f", { arg msg;
			release = msg[1];
		});
		this.addCommand("cutoff", "f", { arg msg;
			cutoff = msg[1];
		});
		this.addCommand("gain", "f", { arg msg;
			gain = msg[1];
		});
		this.addCommand("pan", "f", { arg msg;
			pan = msg[1];
		});
	}
}