Re: [Csnd] Porting Guitarix tube preamp models to Csound?

Date	2014-04-07 20:42
From	"vallste@libero.it"
Subject	Re: [Csnd] Porting Guitarix tube preamp models to Csound?
	Thanks Victor, it's sill not working as expected but at least the code looks better eh eh eh Stefano >----Messaggio originale---- >Da: Victor.Lazzarini@nuim.ie >Data: 07/04/2014 21.32 >A: >Ogg: Re: [Csnd] Porting Guitarix tube preamp models to Csound? > >Other areas that can be simplified: > >Instead of implementing linear interpolation in the code, you can just use a linear >interp table reader, tabiei (in csound6 it accepts non-pow-of-two tables). >All of these lines > > ki = int(af) > if ki < 0 then > aFtube tab 0, itableValve > elseif ki >= itabsize then > aFtube tab itabsize - 1, itableValve > else > af = af - ki > kreadT1 tab ki, itableValve > kreadT2 tab ki + 1, itableValve > aFtube = kreadT1 * (1 - af) + kreadT2 * af > endif > > >get replaced by a single line > >aFtube tablei af, itableValve > > >Victor >On 7 Apr 2014, at 20:16, vallste@libero.it wrote: > >> Yes, I was trying this but unfortunately it's still a noise generator. >> >> >>> ----Messaggio originale---- >>> Da: Victor.Lazzarini@nuim.ie >>> Data: 07/04/2014 21.10 >>> A: >>> Ogg: Re: [Csnd] Porting Guitarix tube preamp models to Csound? >>> >>> In other words, removing the delayr/w, we can have >>> >>> aFtubeOld init 0 >>> aIn_Ftube = aFtubeOld + aIn_tube - kVk0 >>> ; >>> ;itableValve;see table .cc >>> ;ktablow see table .cc for the valve type >>> ;ktabhigh see table .cc for the valve type >>> ;ktabistep see table .cc for the valve type >>> ;itabsize len of the table see table .cc for the valve type >>> aVgk = aIn_Ftube >>> af = (aVgk - ktablow) * ktabistep >>> ki = int(af) >>> if ki < 0 then >>> aFtube tab 0, itableValve >>> elseif ki >= itabsize then >>> aFtube tab itabsize - 1, itableValve >>> else >>> af = af - ki >>> kreadT1 tab ki, itableValve >>> kreadT2 tab ki + 1, itableValve >>> aFtube = kreadT1 * (1 - af) + kreadT2 * af >>> endif >>> ; >>> aFtubeOut = (aFtube + aVkC - kvplus) >>> aFtubeOld butlp aFtubeOut * kRk/kRp, kfck >>> >>> >>> On 7 Apr 2014, at 20:04, Victor Lazzarini wrote: >>> >>>> why the delay line? If it's a 1-sample delay you want to do, it's a bit >> cumbersome to use it for that. >>>> It's simpler to do this (ksmps = 1), for example for a 1st order filter >>>> >>>> adel init 0 >>>> ay = ainia + adelib >>>> adel = ay >>>> >>>> adel is a 1-sample feedback delay. >>>> >>>> >>>> On 7 Apr 2014, at 18:07, vallste@libero.it wrote: >>>> >>>>> Hello, >>>>> I'm trying to port Gutarix tubes emulations to Csound ( I know that is >> possible to export as csound plugins but want to try the long way). >>>>> Under Faust sources there are the examples >>>>> http://sourceforge. net/p/faudiostream/code/ci/master/tree/examples/faust- >> tubes/ >>>>> and data used for transfer functions for each tube model (files valve. h, >> tube.lib, preamp.dsp, and .cc files for tubes). >>>>> >>>>> Attached here is my tentative udo (plus a couple tube emulations transfer >> funcions used by gen23) and a file to test it but everything I can obtain is a >> nice noise generator with only one stage of amplification, go figure what >> happen if you add more than one...Suspect that there is a problem on how I >> implemented recursion with delayw/r. >>>>> >>>>> Anyone would like to give a look to the code to see what I'm doing wrong? >>>>> I've put output to disk in the tubetest.csd to avoid bad surpises to the >> speakers. >>>>> >>>>> Bye >>>>> Stefano >>>>> <12ax7_250k.inc><12ax7_68k.inc><12at7_250k. >> inc><12at7_68k.inc> >>>> >>>> Dr Victor Lazzarini >>>> Senior Lecturer >>>> Dept. of Music >>>> NUI Maynooth Ireland >>>> tel.: +353 1 708 3545 >>>> Victor dot Lazzarini AT nuim dot ie >>>> >>>> >>>> >>>> >>>> >>>> Send bugs reports to >>>> https://github.com/csound/csound/issues >>>> Discussions of bugs and features can be posted here >>>> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe >> csound" >>>> >>>> >>>> >>> >>> Dr Victor Lazzarini >>> Senior Lecturer >>> Dept. of Music >>> NUI Maynooth Ireland >>> tel.: +353 1 708 3545 >>> Victor dot Lazzarini AT nuim dot ie >>> >>> >>> >>> >>> >>> Send bugs reports to >>> https://github.com/csound/csound/issues >>> Discussions of bugs and features can be posted here >>> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe >> csound" >>> >>> >>> >>> >> >> >> >> >> Send bugs reports to >> https://github.com/csound/csound/issues >> Discussions of bugs and features can be posted here >> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound" >> >> >> > >Dr Victor Lazzarini >Senior Lecturer >Dept. of Music >NUI Maynooth Ireland >tel.: +353 1 708 3545 >Victor dot Lazzarini AT nuim dot ie > > > > > >Send bugs reports to > https://github.com/csound/csound/issues >Discussions of bugs and features can be posted here >To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound" > > > >

Date	2014-04-08 09:38
From	Victor Lazzarini
Subject	Re: [Csnd] Porting Guitarix tube preamp models to Csound?
	I just ran your code here and I am not getting noise at the UDO output. There is no distortion either, the output is generally clean. ======================== Dr Victor Lazzarini Senior Lecturer NUI Maynooth, Ireland victor dot lazzarini at nuim dot ie On 7 Apr 2014, at 20:42, vallste@libero.it wrote: > Thanks Victor, it's sill not working as expected but at least the code looks > better eh eh eh > Stefano > >> ----Messaggio originale---- >> Da: Victor.Lazzarini@nuim.ie >> Data: 07/04/2014 21.32 >> A: >> Ogg: Re: [Csnd] Porting Guitarix tube preamp models to Csound? >> >> Other areas that can be simplified: >> >> Instead of implementing linear interpolation in the code, you can just use a > linear >> interp table reader, tabiei (in csound6 it accepts non-pow-of-two tables). >> All of these lines >> >> ki = int(af) >> if ki < 0 then >> aFtube tab 0, itableValve >> elseif ki >= itabsize then >> aFtube tab itabsize - 1, itableValve >> else >> af = af - ki >> kreadT1 tab ki, itableValve >> kreadT2 tab ki + 1, itableValve >> aFtube = kreadT1 * (1 - af) + kreadT2 * af >> endif >> >> >> get replaced by a single line >> >> aFtube tablei af, itableValve >> >> >> Victor >> On 7 Apr 2014, at 20:16, vallste@libero.it wrote: >> >>> Yes, I was trying this but unfortunately it's still a noise generator. >>> >>> >>>> ----Messaggio originale---- >>>> Da: Victor.Lazzarini@nuim.ie >>>> Data: 07/04/2014 21.10 >>>> A: >>>> Ogg: Re: [Csnd] Porting Guitarix tube preamp models to Csound? >>>> >>>> In other words, removing the delayr/w, we can have >>>> >>>> aFtubeOld init 0 >>>> aIn_Ftube = aFtubeOld + aIn_tube - kVk0 >>>> ; >>>> ;itableValve;see table .cc >>>> ;ktablow see table .cc for the valve type >>>> ;ktabhigh see table .cc for the valve type >>>> ;ktabistep see table .cc for the valve type >>>> ;itabsize len of the table see table .cc for the valve type >>>> aVgk = aIn_Ftube >>>> af = (aVgk - ktablow) * ktabistep >>>> ki = int(af) >>>> if ki < 0 then >>>> aFtube tab 0, itableValve >>>> elseif ki >= itabsize then >>>> aFtube tab itabsize - 1, itableValve >>>> else >>>> af = af - ki >>>> kreadT1 tab ki, itableValve >>>> kreadT2 tab ki + 1, itableValve >>>> aFtube = kreadT1 * (1 - af) + kreadT2 * af >>>> endif >>>> ; >>>> aFtubeOut = (aFtube + aVkC - kvplus) >>>> aFtubeOld butlp aFtubeOut * kRk/kRp, kfck >>>> >>>> >>>> On 7 Apr 2014, at 20:04, Victor Lazzarini wrote: >>>> >>>>> why the delay line? If it's a 1-sample delay you want to do, it's a bit >>> cumbersome to use it for that. >>>>> It's simpler to do this (ksmps = 1), for example for a 1st order filter >>>>> >>>>> adel init 0 >>>>> ay = ainia + adelib >>>>> adel = ay >>>>> >>>>> adel is a 1-sample feedback delay. >>>>> >>>>> >>>>> On 7 Apr 2014, at 18:07, vallste@libero.it wrote: >>>>> >>>>>> Hello, >>>>>> I'm trying to port Gutarix tubes emulations to Csound ( I know that is >>> possible to export as csound plugins but want to try the long way). >>>>>> Under Faust sources there are the examples >>>>>> http://sourceforge. > net/p/faudiostream/code/ci/master/tree/examples/faust- >>> tubes/ >>>>>> and data used for transfer functions for each tube model (files valve. > h, >>> tube.lib, preamp.dsp, and .cc files for tubes). >>>>>> >>>>>> Attached here is my tentative udo (plus a couple tube emulations > transfer >>> funcions used by gen23) and a file to test it but everything I can obtain > is a >>> nice noise generator with only one stage of amplification, go figure what >>> happen if you add more than one...Suspect that there is a problem on how I >>> implemented recursion with delayw/r. >>>>>> >>>>>> Anyone would like to give a look to the code to see what I'm doing > wrong? >>>>>> I've put output to disk in the tubetest.csd to avoid bad surpises to > the >>> speakers. >>>>>> >>>>>> Bye >>>>>> Stefano >>>>>> <12ax7_250k.inc><12ax7_68k.inc><12at7_250k. >>> inc><12at7_68k.inc> >>>>> >>>>> Dr Victor Lazzarini >>>>> Senior Lecturer >>>>> Dept. of Music >>>>> NUI Maynooth Ireland >>>>> tel.: +353 1 708 3545 >>>>> Victor dot Lazzarini AT nuim dot ie >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> Send bugs reports to >>>>> https://github.com/csound/csound/issues >>>>> Discussions of bugs and features can be posted here >>>>> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe >>> csound" >>>>> >>>>> >>>>> >>>> >>>> Dr Victor Lazzarini >>>> Senior Lecturer >>>> Dept. of Music >>>> NUI Maynooth Ireland >>>> tel.: +353 1 708 3545 >>>> Victor dot Lazzarini AT nuim dot ie >>>> >>>> >>>> >>>> >>>> >>>> Send bugs reports to >>>> https://github.com/csound/csound/issues >>>> Discussions of bugs and features can be posted here >>>> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe >>> csound" >>>> >>>> >>>> >>>> >>> >>> >>> >>> >>> Send bugs reports to >>> https://github.com/csound/csound/issues >>> Discussions of bugs and features can be posted here >>> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe > csound" >>> >>> >>> >> >> Dr Victor Lazzarini >> Senior Lecturer >> Dept. of Music >> NUI Maynooth Ireland >> tel.: +353 1 708 3545 >> Victor dot Lazzarini AT nuim dot ie >> >> >> >> >> >> Send bugs reports to >> https://github.com/csound/csound/issues >> Discussions of bugs and features can be posted here >> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe > csound" >> >> >> >> > > > > > Send bugs reports to > https://github.com/csound/csound/issues > Discussions of bugs and features can be posted here > To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound" > > >