If you use table/tablei you can experiment with different windows stored in a function table. GEN20 can generate 
different types, but you can use other GENs or even custom expressions.
========================
Prof. Victor Lazzarini
Dean of Arts, Celtic Studies, and Philosophy,
Maynooth University,
Maynooth, Co Kildare, Ireland
Tel: 00 353 7086936
Fax: 00 353 1 7086952 

> On 17 Jan 2017, at 06:59, Emmett Palaima  wrote:
> 
> I recently made a simple reverse delay UDO for use in a larger sound design project I'm working on. It uses delayr and deltapn with a linearly increasing delay time to create the reverse delay effect. In order to prevent clicks when the buffer read position shifts to the beginning of another reversed echo I window the delay output with a sine function. This works to get rid of the clicks, but creates a noticeable tremelo effect in the output. 
> 
> I was wondering if there is an easy way within csound to generate something more rectangular like a tukey window based on the buffer postion. Any suggestions?
> 
> Included below are my opcode and a test instrument that uses it. 
> 
> turnon "revTest"
> 
> opcode reverseDelay, a, akki
> setksmps 1
> ain, kfb, kdel, imaxdel xin
> 
> krev init 1
> 
> kenv = sin($M_PI*sqrt(krev/kdel))
> 
> printks "KENV: %f\n", .1, kenv
> 
> abuffer delayr imaxdel
> adel deltapn krev
> adel *= kenv
> delayw ain + adel * kfb
> krev += 2
> if(krev >= kdel)then
> krev -= kdel
> endif
> xout adel
> endop
> instr revTest
> 
> adry, adry2 ins
> adel	reverseDelay adry, .5, 24000, 1
> 
> outs adel, adel
> 
> endin
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Hi,
You can get around it by creating two overlapping delay processes, so
that another process is sounding when you reset the delay time.
Oeyvind

2017-01-16 22:59 GMT-08:00 Emmett Palaima :
> I recently made a simple reverse delay UDO for use in a larger sound design
> project I'm working on. It uses delayr and deltapn with a linearly
> increasing delay time to create the reverse delay effect. In order to
> prevent clicks when the buffer read position shifts to the beginning of
> another reversed echo I window the delay output with a sine function. This
> works to get rid of the clicks, but creates a noticeable tremelo effect in
> the output.
>
>
> I was wondering if there is an easy way within csound to generate something
> more rectangular like a tukey window based on the buffer postion. Any
> suggestions?
>
>
> Included below are my opcode and a test instrument that uses it.
>
>
> turnon "revTest"
>
>
> opcode reverseDelay, a, akki
>
> setksmps 1
>
> ain, kfb, kdel, imaxdel xin
>
>
> krev init 1
>
>
> kenv = sin($M_PI*sqrt(krev/kdel))
>
>
> printks "KENV: %f\n", .1, kenv
>
>
> abuffer delayr imaxdel
>
> adel deltapn krev
>
> adel *= kenv
>
> delayw ain + adel * kfb
>
> krev += 2
>
> if(krev >= kdel)then
>
> krev -= kdel
>
> endif
>
> xout adel
>
> endop
>
> instr revTest
>
>
> adry, adry2 ins
>
> adel reverseDelay adry, .5, 24000, 1
>
>
> outs adel, adel
>
>
> endin
>
> Csound mailing list Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to
> https://github.com/csound/csound/issues Discussions of bugs and features can
> be posted here