What you want to do is sweep among positive values and
then *Multiply* the loscil freq arg by this amount.  You
see, the loscil arg is a coefficient itself, not an offset.

Any way, your example ends up generating negative pitch
values which sort of wrap around to high pitches again
giving you a 'valley' sort of result.

Toby

	-There otta be a law-




David Schuyeteneer wrote:
> 
> I try to pitchdown a loscil unit with a line opcode but it sweeps back
> pitching up !!
> I don't understand this because i clearly set the idur of the line to p3
> and not p3/2 or something...
> 
> Please explain me this fellow Csounders...
> 
> orc & sco are included below and the needed soundfile was 710kb, a little
> too much...so create
> a soundfile yourself of 363791 sampleframes at 16bit at 44100 Hz.
> 
> David.
> 
> *** ORC *********************
> *******************************
> sr = 44100
> kr = 441
> ksmps  = 100
> nchnls = 1
> 
> ;---------------------------------------------------------------------------
> -------
> ;
> ; loscil test instrument.
> ;
> ;---------------------------------------------------------------------------
> -------
> 
> instr 1
> 
> khold oscil 50,0.3,2
> kvib randh 1,abs(khold)
> kdown line 1,p3,-5
> 
> ;  loscil xamp,   kcps,    ifn,[ibasefreq,][imod1, ibeg, iend]
> a1 loscil 10000, 1+kvib,    1,    1     ,    1,     0,   363790
> a2 loscil 10000, kdown,   1,    1     ,    1,     0,   363790
> 
> out a1+a2
> 
> endin
> 
> *** SCO *********************
> *******************************
> 
> ;GEN 01 : soundfile input
> ;f# time size 1    filcod    skiptime format channel
>  f1  0    0   1 "speak3.aif"    0       0       0
>  f2  0    256 10 1
> 
> i1 0 30
> 
> e
>