DirectCsound 2.1 suffers of a serious bug: if one use variables before it was defined, no
error messages are shown. The variables are used containig zero.
This bug is fixed in version 2.11

Yair Kass wrote:
> 
> Hi list,
> 
> This is something i encountered when moving
> from Direct2.1 to Direct2.11.
> I wouldn't say it's a bug (maybe an improvement)
> but i'm reporting this for those who may be interested:
> 
> The code below plays a sine wave while the user
> controls the depth of a vibrato.
> Direct2.1 didn't mind that 'kenv' is used
> (as the max. value for 'kenvdp') before it is defined.
> But Direct2.11 DID.
> To fix that, just put the 'kenvdp ctrl7.........' line
> AFTER 'kenv' is defined.
> 
> I know this may sound (or be) very  trivial but since
> there was a difference between the two version's
> performance, I thought I'd say something.
> Hope this helps (:-}
> Yair
> 
> ;------------------------------------------------------------
> sr         = 44100
> kr         = 441
> ksmps  = 100
> nchnls  = 1
> 
> instr 1
> ihold                                  ;Keep instrument on.
> 
> kenvdp ctrl7 1,1,  1,kenv   ;Controls the depth of the vibrato
> 
> kenv   oscili 0.5,2,1            ;Vib -
> kenv   = kenv+0.5              ; - rato
> 
> asig   oscili 20000,440,1    ;Carrier
> aout   = asig*kenvdp          ;Modulate
>        out aout
> endin
> ;--------------------------------------------------------------
> f1 0 4096 10 1 ;Simple sine wave
> f0 600
> i1 0 1
> e
> ;--------------------------------------------------------------

-- 
Gabriel Maldonado

http://www.agora.stm.it/G.Maldonado/home2.htm