Re: [linux-audio-dev] XAP: a polemic

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Subject: Re: [linux-audio-dev] XAP: a polemic
From: Paul Davis (paul_AT_linuxaudiosystems.com)
Date: Mon Dec 16 2002 - 15:16:20 EET


>>>for a plugin within the system, there's no point in caring
>>>about those that are not, except you want it to work as a
>>>sync source. is this what you want?
>>
>>just imagine two different timelines, one in 6/8, the other in 5/4,
>>both at different tempos. one delay plugin uses one of them, another
>>uses the other. neither of these timelines are uniform across the
>>system, yet plugins with tempo-synced parameters need to care about
>>(at least one of) them. right?
>
>you can, without loss of information, express both as ticks,
>and you're back to the uniform timebase.

how so? if ticks are constant-per-beat, i don't see how they can
express the information without the additional beat-per-second
value(s). if ticks are constant-per-second, i don't see how they can
express the information without the additional ticks-per-beat
value(s). any tempo-synced element to an XAP plugin needs to translate
a musical time/duration to a tick value (and thence to audio frame
units). doing this requires two pieces of information, one of which is
not constant across all musical timelines.

>many uses of tempo-sync only make use of small note lengths
>(16th, 8th triplet etc) so they do not need this mapping.

i don't think that the note length affects this in any way.

--p


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