On Saturday 07 January 2006 23:44, Steven Yi wrote:

> (The lpf2 is a direct translation of lpf2 in Music4C.)  If I either
> set ksmps=1 in the project or use setksmps 1 as in the above, things
> sound correctly.  If I don't use setksmps or ksmps=1, the sound is
> wrong.  However, looking at the code, all of the calculations in lpf2
> *should* run at arate and calculate correctly without having to set
> ksmps.
> 
> Is there something wrong with my assumption or is there a bug either
> in my code or in UDO's?

Having a quick look at the code, it seems that there is a-rate
feedback which requires ksmps=1 (as the feedback has a delay of
ksmps samples); see lines quoted below:

> afstate0	init 0
> afstate1	init 0 	
> 
> /* LPF2 CODE */
> 
> av1	= ain + ifparms3 * afstate0  + ifparms4* afstate1;
> av2	= afstate1 + 2.0 * afstate0;
> 
> afstate1 = afstate0
> afstate0 = av1