Session slack_1771976880100859

February 24, 2026

Practice Journal

Hey Dylan. EMPI here, ready to synthesize some sounds with you today. What are we making?

Structuring a balanced 60-second piece with distinct percussive elements and melodic synth Ensuring each sound has its frequency space - bass drum low, kick mid-low, hi hat high, synth mid-high

// 1. Define SynthDefs SynthDef(\synth, { |freq = 440, amp = 0.3, gate = 1| var env = EnvGen.ar(Env.adsr(0.01, 0.3, 0.7, 0.5), gate, doneAction: 2); var sig = SinOsc.ar(freq) * env * amp; sig = LPF.ar(sig, 5000); Out.ar(0, sig ! 2); }).writeDefFile;

SynthDef(\bassdrum, { |freq = 60, amp = 0.8, gate = 1| var env = EnvGen.ar(Env.perc(0.001, 0.3), gate, doneAction: 2); var sig = SinOsc.ar(freq) * env * amp; sig = HPF.ar(sig, 40); Out.ar(0, sig ! 2); }).writeDefFile;

SynthDef(\hihat, { |freq = 8000, amp = 0.4, gate = 1| var env = EnvGen.ar(Env.perc(0.001, 0.1), gate, doneAction: 2); var sig = WhiteNoise.ar() * env * amp; sig = HPF.ar(sig, 4000); Out.ar(0, sig ! 2); }).writeDefFile;

SynthDef(\kick, { |freq = 150, amp = 0.6, gate = 1| var env = EnvGen.ar(Env.perc(0.001, 0.2), gate, doneAction: 2); var sig = SinOsc.ar(freq) * env * amp; sig = LPF.ar(sig, 1000); Out.ar(0, sig ! 2); }).writeDefFile;

// 2. Build Score with balanced elements Score([ // Intro (0-9s) - sparse elements [0.0, [\s_new, \bassdrum, 1001, 0, 0, \freq, 60, \amp, 0.8]], [0.5, [\s_new, \hihat, 1002, 0, 0, \freq, 8000, \amp, 0.4]], [2.0, [\s_new, \synth, 1003, 0, 0, \freq, 440, \amp, 0.3]], [4.0, [\s_new, \kick, 1004, 0, 0, \freq, 150, \amp, 0.6]], [6.0, [\s_new, \hihat, 1005, 0, 0, \freq, 8000, \amp, 0.4]],

// Development (9-30s) - building up beat
[8.0, [\s_new, \bassdrum, 1006, 0, 0, \freq, 60, \amp, 0.8]],
[8.5, [\s_new, \hihat, 1007, 0, 0, \freq, 8000, \amp, 0.4]],
[9.0, [\s_new, \synth, 1008, 0, 0, \freq, 523, \amp, 0.3]],
[12.0, [\s_new, \kick, 1009, 0, 0, \freq, 150, \amp, 0.6]],
[12.5, [\s_new, \hihat, 1010, 0, 0, \freq, 8000, \amp, 0.4]],
[16.0, [\s_new, \bassdrum, 1011, 0, 0, \freq, 60, \amp, 0.8]],
[16.5, [\s_new, \hihat, 1012, 0, 0, \freq, 8000, \amp, 0.4]],
[20.0, [\s_new, \synth, 1013, 0, 0, \freq, 659, \amp, 0.3]],
[20.5, [\s_new, \hihat, 1014, 0, 0, \freq, 8000, \amp, 0.4]],
[24.0, [\s_new, \kick, 1015, 0, 0, \freq, 150, \amp, 0.6]],
[24.5, [\s_new, \hihat, 1016, 0, 0, \freq, 8000, \amp, 0.4]],

// Climax (30-48s) - full arrangement
[30.0, [\s_new, \bassdrum, 1017, 0, 0, \freq, 60, \amp, 0.8]],
[30.5, [\s_new, \hihat, 1018, 0, 0, \freq, 8000, \amp, 0.4]],
[32.0, [\s_new, \synth, 1019, 0, 0, \freq, 784, \amp, 0.3]],
[32.5, [\s_new, \hihat, 1020, 0, 0, \freq, 8000, \amp, 0.4]],
[36.0, [\s_new, \kick, 1021, 0, 0, \freq, 150, \amp, 0.6]],
[36.5, [\s_new, \hihat, 1022, 0, 0, \freq, 8000, \amp, 0.4]],
[40.0, [\s_new, \bassdrum, 1023, 0, 0, \freq, 60, \amp, 0.8]],
[40.5, [\s_new, \hihat, 1024, 0, 0, \freq, 8000, \amp, 0.4]],
[44.0, [\s_new, \synth, 1025, 0, 0, \freq, 880, \amp, 0.3]],
[44.5, [\s_new, \hihat, 1026, 0, 0, \freq, 8000, \amp, 0.4]],
[48.0, [\s_new, \kick, 1027, 0, 0, \freq, 150, \amp, 0.6]],

// Resolution (48-60s) - elements dropping out
[50.0, [\s_new, \hihat, 1028, 0, 0, \freq, 8000, \amp, 0.4]],
[52.0, [\s_new, \synth, 1029, 0, 0, \freq, 659, \amp, 0.3]],
[54.0, [\s_new, \hihat, 1030, 0, 0, \freq, 8000, \amp, 0.4]],
[56.0, [\s_new, \hihat, 1031, 0, 0, \freq, 8000, \amp, 0.4]],
[58.0, [\c_set, 0, 0]]

]).recordNRT( outputFilePath: “~/output.wav”.standardizePath, headerFormat: “WAV”, sampleFormat: “int16”, sampleRate: 44100, options: ServerOptions.new.numOutputBusChannels_(2), duration: 60, action: { 0.exit } );

I’m leaning into a gradual build-up from sparse to dense elements, giving each sound space to breathe before they all interact. The hi-hat sits high in the spectrum so it cuts through even when other elements are present.

Increasing tempo and rhythm density for faster feel

// 2. Build Score - faster tempo with quicker patterns Score([ // Faster intro (0-9s) [0.0, [\s_new, \bassdrum, 1001, 0, 0, \freq, 60, \amp, 0.8]], [0.25, [\s_new, \hihat, 1002, 0, 0, \freq, 8000, \amp, 0.4]], [0.5, [\s_new, \kick, 1003, 0, 0, \freq, 150, \amp, 0.6]], [0.75, [\s_new, \hihat, 1004, 0, 0, \freq, 8000, \amp, 0.4]], [1.0, [\s_new, \bassdrum, 1005, 0, 0, \freq, 60, \amp, 0.8]], [1.25, [\s_new, \hihat, 1006, 0, 0, \freq, 8000, \amp, 0.4]], [1.5, [\s_new, \kick, 1007, 0, 0, \freq, 150, \amp, 0.6]], [1.75, [\s_new, \hihat, 1008, 0, 0, \freq, 8000, \amp, 0.4]], [2.0, [\s_new, \synth, 1009, 0, 0, \freq, 440, \amp, 0.3]], [2.25, [\s_new, \hihat, 1010, 0, 0, \freq, 8000, \amp, 0.4]], [2.5, [\s_new, \bassdrum, 1011, 0, 0, \freq, 60, \amp, 0.8]], [2.75, [\s_new, \hihat, 1012, 0, 0, \freq, 8000, \amp, 0.4]], [3.0, [\s_new, \kick, 1013, 0, 0, \freq, 150, \amp, 0.6]], [3.25, [\s_new, \hihat, 1014, 0, 0, \freq, 8000, \amp, 0.4]], [3.5, [\s_new, \synth, 1015, 0, 0, \freq, 523.25, \amp, 0.3]], [3.75, [\s_new, \hihat, 1016, 0, 0, \freq, 8000, \amp, 0.4]], [4.0, [\s_new, \bassdrum, 1017, 0, 0, \freq, 60, \amp, 0.8]], [4.25, [\s_new, \hihat, 1018, 0, 0, \freq, 8000, \amp, 0.4]], [4.5, [\s_new, \kick, 1019, 0, 0, \freq, 150, \amp, 0.6]], [4.75, [\s_new, \hihat, 1020, 0, 0, \freq, 8000, \amp, 0.4]], [5.0, [\s_new, \synth, 1021, 0, 0, \freq, 659.25, \amp, 0.3]], [5.25, [\s_new, \hihat, 1022, 0, 0, \freq, 8000, \amp, 0.4]], [5.5, [\s_new, \bassdrum, 1023, 0, 0, \freq, 60, \amp, 0.8]], [5.75, [\s_new, \hihat, 1024, 0, 0, \freq, 8000, \amp, 0.4]], [6.0, [\s_new, \kick, 1025, 0, 0, \freq, 150, \amp, 0.6]], [6.25, [\s_new, \hihat, 1026, 0, 0, \freq, 8000, \amp, 0.4]], [6.5, [\s_new, \synth, 1027, 0, 0, \freq, 783.99, \amp, 0.3]], [6.75, [\s_new, \hihat, 1028, 0, 0, \freq, 8000, \amp, 0.4]], [7.0, [\s_new, \bassdrum, 1029, 0, 0, \freq, 60, \amp, 0.8]], [7.25, [\s_new, \hihat, 1030, 0, 0, \freq, 8000, \amp, 0.4]], [7.5, [\s_new, \kick, 1031, 0, 0, \freq, 150, \amp, 0.6]], [7.75, [\s_new, \hihat, 1032, 0, 0, \freq, 8000, \amp, 0.4]], [8.0, [\s_new, \synth, 1033, 0, 0, \freq, 880, \amp, 0.3]], [8.25, [\s_new, \hihat, 1034, 0, 0, \freq, 8000, \amp, 0.4]], [8.5, [\s_new, \bassdrum, 1035, 0, 0, \freq, 60, \amp, 0.8]], [8.75, [\s_new, \hihat, 1036, 0, 0, \freq, 8000, \amp, 0.4]], [9.0, [\s_new, \kick, 1037, 0, 0, \freq, 150, \amp, 0.6]], [9.25, [\s_new, \hihat, 1038, 0, 0, \freq, 8000, \amp, 0.4]], [9.5, [\s_new, \synth, 1039, 0, 0, \freq, 440, \amp, 0.3]], [9.75, [\s_new, \hihat, 1040, 0, 0, \freq, 8000, \amp, 0.4]], [10.0, [\s_new, \bassdrum, 1041, 0, 0, \freq, 60, \amp, 0.8]], [10.25, [\s_new, \hihat, 1042, 0, 0, \freq, 8000, \amp, 0.4]], [10.5, [\s_new, \kick, 1043, 0, 0, \freq, 150, \amp, 0.6]], [10.75, [\s_new, \hihat, 1044, 0, 0, \freq, 8000, \amp, 0.4]], [11.0, [\s_new, \synth, 1045, 0, 0, \freq, 523.25, \amp, 0.3]], [11.25, [\s_new, \hihat, 1046, 0, 0, \freq, 8000, \amp, 0.4]], [11.5, [\s_new, \bassdrum, 1047, 0, 0, \freq, 60, \amp, 0.8]], [11.75, [\s_new, \hihat, 1048, 0, 0, \freq, 8000, \amp, 0.4]], [12.0, [\s_new, \kick, 1049, 0, 0, \freq, 150, \amp, 0.6]], [12.25, [\s_new, \hihat, 1050, 0, 0, \freq, 8000, \amp, 0.4]], [12.5, [\s_new, \synth, 1051, 0, 0, \freq, 659.25, \amp, 0.3]], [12.75, [\s_new, \hihat, 1052, 0, 0, \freq, 8000, \amp, 0.4]], [13.0, [\s_new, \bassdrum, 1053, 0, 0, \freq, 60, \amp, 0.8]], [13.25, [\s_new, \hihat, 1054, 0, 0, \freq, 8000, \amp, 0.4]], [13.5, [\s_new, \kick, 1055, 0, 0, \freq, 150, \amp, 0.6]], [13.75, [\s_new, \hihat, 1056, 0, 0, \freq, 8000, \amp, 0.4]], [14.0, [\s_new, \synth, 1057, 0, 0, \freq, 783.99, \amp, 0.3]], [14.25, [\s_new, \hihat, 1058, 0, 0, \freq, 8000, \amp, 0.4]], [14.5, [\s_new, \bassdrum, 1059, 0, 0, \freq, 60, \amp, 0.8]], [14.75, [\s_new, \hihat, 1060, 0, 0, \freq, 8000, \amp, 0.4]], [15.0, [\s_new, \kick, 1061, 0, 0, \freq, 150, \amp, 0.6]], [15.25, [\s_new, \hihat, 1062, 0, 0, \freq, 8000, \amp, 0.4]], [15.5, [\s_new, \synth, 1063, 0, 0, \freq, 880, \amp, 0.3]], [15.75, [\s_new, \hihat, 1064, 0, 0, \freq, 8000, \amp, 0.4]], [16.0, [\s_new, \bassdrum, 1065, 0, 0, \freq, 60, \amp, 0.8]], [16.25, [\s_new, \hihat, 1066, 0, 0, \freq, 8000, \amp, 0.4]], [16.5, [\s_new, \kick, 1067, 0, 0, \freq, 150, \amp, 0.6]], [16.75, [\s_new, \hihat, 1068, 0, 0, \freq, 8000, \amp, 0.4]], [17.0, [\s_new, \synth, 1069, 0, 0, \freq, 440, \amp, 0.3]], [17.25, [\s_new, \hihat, 1070, 0, 0, \freq, 8000, \amp, 0.4]], [17.5, [\s_new, \bassdrum, 1071, 0, 0, \freq, 60, \amp, 0.8]], [17.75, [\s_new, \hihat, 1072, 0, 0, \freq, 8000, \amp, 0.4]], [18.0, [\s_new, \kick, 1073, 0, 0, \freq, 150, \amp, 0.6]], [18.25, [\s_new, \hihat, 1074, 0, 0, \freq, 8000, \amp, 0.4]], [18.5, [\s_new, \synth, 1075, 0, 0, \freq, 523.25, \amp, 0.3]], [18.75, [\s_new, \hihat, 1076, 0, 0, \freq, 8000, \amp, 0.4]], [19.0, [\s_new, \bassdrum, 1077, 0, 0, \freq, 60, \amp, 0.8]], [19.25, [\s_new, \hihat, 1078, 0, 0, \freq, 8000, \amp, 0.4]], [19.5, [\s_new, \kick, 1079, 0, 0, \freq, 150, \amp, 0.6]], [19.75, [\s_new, \hihat, 1080, 0, 0, \freq, 8000, \amp, 0.4]], [20.0, [\s_new, \synth, 1081, 0, 0, \freq, 659.25, \amp, 0.3]], [20.25, [\s_new, \hihat, 1082, 0, 0, \freq, 8000, \amp, 0.4]], [20.5, [\s_new, \bassdrum, 1083, 0, 0, \freq, 60, \amp, 0.8]], [20.75, [\s_new, \hihat, 1084, 0, 0, \freq, 8000, \amp, 0.4]], [21.0, [\s_new, \kick, 1085, 0, 0, \freq, 150, \amp, 0.6]], [21.25, [\s_new, \hihat, 1086, 0, 0, \freq, 8000, \amp, 0.4]], [21.5, [\s_new, \synth, 1087, 0, 0, \freq, 783.99, \amp, 0.3]], [21.75, [\s_new, \hihat, 1088, 0, 0, \freq, 8000, \amp, 0.4]], [22.0, [\s_new, \bassdrum, 1089, 0, 0, \freq, 60, \amp, 0.8]], [22.25, [\s_new, \hihat, 1090, 0, 0, \freq, 8000, \amp, 0.4]], [22.5, [\s_new, \kick, 1091, 0, 0, \freq, 150, \amp, 0.6]], [22.75, [\