"Unnoticeable" latency usually refers to the musician not noticing the difference in time between when they press the key and when the sound comes out. Any time you add a delayed signal to the original signal, you will notice it. The "slap-back" happens at longer latencies, but at shorter latencies you will hear *very* noticeable comb-filtering. And since no computer-based solution is latency-free, I think you need to re-examine what you are expecting Pd to do. Either that, or go with a dedicated DSP board (and learn the accompanying programming!) which would give you a more guitar-pedal-like "zero-latency" system.
Maybe Marco Donnarumma could give a few words here on processing instruments live. His set uses an electric bass through Pd. My guess is that even the un-processed signal goes through Pd to avoid echos or comb filtering due to latency.
Best, Derek
Jeffrey Concepcion wrote:
* in terms of processor capacity, hardware, and sound card configuration, what would be the minimum requirements to achieve unnoticeable latency (not hear the affected signal as a slap-back type of effect)? i've read that 11ms can be achieved and is unnoticeable.