improve csound bindings:

- better timing
- can now pass instrument to .csound(...)
- can now write instruments with csound(...)

packages/csound/csd.mjs

@@ -0,0 +1,60 @@
+export function csd(code = '') {
+  return `
+<CsoundSynthesizer>
+<CsOptions>
+-o dac --port=10000 --sample-accurate
+</CsOptions>
+<CsInstruments>
+sr=48000
+ksmps=64
+nchnls=2
+0dbfs=1
+
+instr organ
+    iduration = p3
+    ifreq = p4
+    igain = p5
+    ioct = octcps(ifreq)
+
+    asig = vco2(igain, ifreq, 12, .5) ; my edit
+    kpwm = oscili(.1, 5)
+    asig = vco2(igain, ifreq, 4, .5 + kpwm)
+    asig += vco2(igain/4, ifreq * 2)
+
+    ; filter
+    ; idepth = 2
+    ; acut = transegr:a(0, .005, 0, idepth, .06, -4.2, 0.001, .01, -4.2, 0) ; filter envelope
+    ; asig = zdf_2pole(asig, cpsoct(ioct + acut), 0.5)
+
+    ; amp envelope
+    iattack = .001
+    irelease = .05
+    asig *= linsegr:a(0, iattack, 1, iduration, 1, irelease, 0)
+
+    out(asig, asig)
+
+endin
+
+instr triangle
+    iduration = p3
+    ifreq = p4
+    igain = p5
+    ioct = octcps(ifreq)
+
+    asig = vco2(igain, ifreq, 12, .5)
+
+    ; amp envelope
+    iattack = .001
+    irelease = .05
+    asig *= linsegr:a(0, iattack, 1, iduration, 1, irelease, 0)
+
+    out(asig, asig)
+
+endin
+
+${code}
+
+</CsInstruments>
+</CsoundSynthesizer>
+`;
+}