You might get some mileage out of this UDO. I wanted to create that retrigger slice effect you get in audio trackers.
/*
trackerSplice - signal splicer
DESCRIPTION
This UDO performs realtime re-triggering and reversing of samples in a style similar to that found on most audio trackers. The main difference here is that the samples are being created on the fly during run-time.
SYNTAX
ares trackerSplice asig, ksegLength, kmode
PERFORMANCE
asig - input signal
ksegLength - length of re-triggered sample in seconds, for now max=1, if you need longer just change the size of your function table
kmode - either 0, 1, 2 depending on what you want. 0 does no processing, 1 will re-trigger and 2 will reverse
CREDITS
Rory Walsh. Mar 2011
*/
opcode trackerSplice, a, akk
asig, kseglength, kmode xin
setksmps 1
kindx init 0
ksamp init 1
aout init 0
itbl ftgenonce 0, 0, 2^16, 7, 0, 2^16, 0 ;create table to hold samples
kseglength = kseglength*sr ;convert length to samples
andx phasor sr/ftlen(itbl) ;ensure phasor is set to correct freq
tabw asig, andx*ftlen(itbl), itbl ;write signal to table
andx1 delay andx, 1 ;insert a 1 sample delay so that the read point
;always stays one sample behind the write pointer
apos samphold andx1*ftlen(itbl), ksamp ;hold sample position whem ksamp=0
if(kmode>=1 && kmode <2) then ;do retrigger when kmode==1
kpos downsamp apos
kindx = (kindx>kseglength ? 0 : kindx+1)
if(kindx+kpos> ftlen(itbl)) then
kindx = -kseglength
endif
aout table apos+kindx, itbl, 0, 1
ksamp = 0
elseif(kmode>=2 && kmode<3) then ;do reverse when kmode==2
kpos downsamp apos
kindx = ((kindx+kpos)<=0 ? ftlen(itbl)-kpos : kindx-1)
aout table apos+kindx, itbl, 0, 1
ksamp = 0
else ;when kmode==0 simple pass signal through
ksamp = 1
aout = asig
endif
xout aout
endop