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

Date	2014-04-07 20:16
From	"vallste@libero.it"
Subject	Re: [Csnd] Porting Guitarix tube preamp models to Csound?
	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" > > > >

Date	2014-04-07 20:32
From	Victor Lazzarini
Subject	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