Hi,

I issued also a bug report but for people to know and take care I write it also here. I made some experimence with rezzy opcode and be careful with low an high cutoff frequencies:

<CsoundSynthesizer>

<CsOptions>

-odac -d

</CsOptions>

<CsInstruments>

sr = 44100 

ksmps = 32

nchnls = 2

0dbfs = 1

instr 1

    icutoff = p4

    ires = p5

    imode = p6

    aout rezzy pinkish(0.5), icutoff, ires, imode

    out aout

endin

</CsInstruments>

<CsScore>

;x

i 1 0 1 132 100 0 ; under 133Hz lowpass resonant filter explodes

i 1 0 1 132 1 0 ; and it does not depend on amount of the resonance

s

i 1 0 1 13350 100 1 ; above 13350Hz highpass resonant filter explodes

</CsScore>

</CsoundSynthesizer>

Best!

tarmo