Hello,
my physical model patch has a problem I didn't foresee at the beginning: it is based on a delay line as a digital waveguide, I made it with a [delwrite~] and a [vd~] objects. The delay line is close in a loop, so the vd~ help file says that (logically) if stacked with a [delwrite~] after it, the minimum delay of the delay line can be 64.

At 44KHz sampling freq, 64 samples are 1.4ms delay. This means that you *cannot* play any note higher than 1/1.4ms Hz.

As I know that 64 is tipically the frame length used by any pd external, I can imagine that one solution is to restart PD by setting the frame length to be e.g. 32 samples.

Any other solutions?

How do I set the frame length to a new value? Will the CPU load increase by decreasing the frame length?

Thanks, Cheers.

check out block~

Put the delay objects in a subpatch and add a [block~ 1] object in there. That will make the subpatch use a block size of 1 while the rest of the patch can stay at a block size of 64. Take a look at 3.audio.examples/G04.control.blocksize in the help browser for an example.

Uhu, great! Thanks for the suggestion!