linuxaudio.org

Damon Chaplin wrote:

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> On Thu, 2007-04-12 at 15:40 +0200, Robin Gareus wrote:

>> minor detail -  in the jack_process callback:

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>>

>>  add   jack_port_get_total_latency(..) to  Note[i].oscillator_offset;

>

> Can you explain that a bit more - why is it needed?

imagine you "pipe" the output of your synth thru an effect that

introduces a latency (delay).
It might seem insignificant - but: if you use two of those synths with

different Effects afterwards, you get phasing effects!
similar if you have multiple output ports:

http://jackaudio.org/files/docs/html/jack_8h.html#a38
[JACK]MIDI allows to timestamp midi-events. - So the synth-osc's

themselves could be in sync. - try to start two of them, invert the

polarity of one and check if the resulting signal is zero. (bitscope)
If it is, add a LADSPA DJ-EQ (1901) to one of the channels, IIRC that

introduces a latency of 3 samples on that channel and you should hear

some phased signal.
#robin