[PD] latency solutions... and then some

[Pierre Massat]

Hi Jeffrey! I ve been trying to minimize latency in Pd for a year now,
experimenting with various OS and hardware. I m using Pd for the same
purpose, that is live processing of electric instruments (mainly a guitar).
I would recommend using a Linux distro, because they have "realtime"
kernels, and the JACK server, plus you can get the hid object in Pd (which
does not exist on windows). If you want to play live you want to go for
latencies below 7 or 6 ms. I get a 5 ms latency on an old Dell laptop (1
Ghz) with the latest Fedora with the CCRMA realtime kernel.
I can also give you a couple of hints about the interface (I personnaly have
hacked a cheap gamepad and it works great). You can reasonably expect to get
a low-latency live set at a very low cost, provided that you have a quite
recent laptop to work with.

Pierre

2010/1/31 Derek Holzer <derek at umatic.nl>

> "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.
>>
>
> --
> ::: derek holzer ::: http://macumbista.net :::
> ---Oblique Strategy # 18:
> "Balance the consistency principle with the inconsistency principle"
>
>
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