Hi all,
I’m quite new to faust and I’m facing some issues implementing a wavetable
oscillator.
The table I’m using is made of 127 morphing waves of 1 cycle each, with
each cycle of 256 samples.
An instance of the oscillator sounds quite fine. When I try to run 2
instances, it still compiles on FaustLive, but it doesn’t run anymore. By
this I mean that it really doesn’t run because the CPU drops around 2%,
while it should be much higher. Using par primitive in order to run 2
instances of the same osc still gives me the same issue.
I paste here below the code I' working on.
Any ideas what I might be doing wrong?
Thanks for your suggestions,
Alessandro
import("stdfaust.lib");
os_freq_a = hslider("Freq_A [style:knob]",20,20,2000,0.01) : si.smoo;
os_wav_a = hslider("Sel_A [style:knob]",0,0,127,1) : si.smoo;
os_freq_b = hslider("Freq_B [style:knob]",20,20,2000,0.01) : si.smoo;
os_wav_b = hslider("Sel_B [style:knob]",0,0,127,1) : si.smoo;
volume = hslider("Volume [style:knob]",0,0,1,0.01) : si.smoo;
tab1 = soundfile("Set_1[url:{'/Users/alan/wavesets/sin_doubler1.wav'}]", 1)
: !,!,_;
tab2 = soundfile("Set_2[url:{'/Users/alan/wavesets/sin_doubler2.wav'}]", 1)
: !,!,_;
wrap(val,lo,hi) = ba.if(val<lo, fmod(hi-(lo-val),(hi-lo)),
fmod(lo+(val-lo),(hi-lo)));
sah(trg,x) = (*(1 - trg) + x * trg) ~ _;
os_wt(freq,wav,len,sr,steps,tab) = 0.5*((2.0*v1) + (-v0+v2)*dv + (2.0*v0 -
5.0*v1 + 4.0*v2 - v3)*pow(dv,2) + (-v0 + 3.0*v1 - 3.0*v2 + v3)*pow(dv,3))
// Catmull-Rom spline interpolation
with {
counter = %(*:max(len))~+(freq*(len/sr)); // create a phasor with
increment as function of freq
trig = ma.diffn(counter)<0; // 0 when phaze wraps at len else 1
phaze = @(counter,1); // 1s delay so it's in sync with trig
dv = ma.decimal(phaze);
wsel = sah(trig,rint(wav));
bas = rint(wsel)*len;
blend_b = ma.decimal(wsel);
blend_a = 1-blend_b;
b_next = bas+len;
idx1 = wrap(phaze-1.0,0.0,len);
idx2 = idx1 <: _+1-(len*(_>=255.0));
idx3 = idx2 <: _+1-(len*(_>=255.0));
idx4 = idx3 <: _+1-(len*(_>=255.0));
v0 = 0,(blend_a*(idx1+bas)) + (blend_b*(idx1+b_next)) : tab;
v1 = 0,(blend_a*(idx2+bas)) + (blend_b*(idx2+b_next)) : tab;
v2 = 0,(blend_a*(idx3+bas)) + (blend_b*(idx3+b_next)) : tab;
v3 = 0,(blend_a*(idx4+bas)) + (blend_b*(idx4+b_next)) : tab;
};
os_wt_a = os_wt(os_freq_a,os_wav_a,256,ma.SR,127,tab1);
os_wt_b = os_wt(os_freq_b,os_wav_b,256,ma.SR,127,tab2);
process = os_wt_a,os_wt_b :> _*volume;
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