[PD] sync metronome to recording an audio track

[Mario Mey]

Hi, Ron. I made a Multi-FX Looper Machine (MEH-SYSTEM) with KP3 
recording looping style and LOOP-STATION one too (different ways of 
recording and looping, http://www.youtube.com/watch?v=2KIj7O_N3gU, in 
spanish, sorry)

When checking synching, I realized that, when some sample (previously 
recorded) was playing (eg, beatbox), I recorded in another sample bank, 
and, when it started to play, it was unsynched. Why? Because of the 
playing-when-recording latency and the later-playing latency. How did I 
fix it? After recording, it starts playing advanced  some miliseconds 
(*): aproximatly the same of your latency. Mine is 14ms (Jack, 128 
frames/buffer). How did I know my latency or, better, how many ms I 
should add to the playing? (because, depends on the patch, the minimum 
latency could be different (less) than the final latency of the patch). 
Using latency-meter (from Katja 
http://puredata.hurleur.com/viewtopic.php?pid=38375#p38375) and some 
testing abstracts with visual arrays and adjustable new latency.

I hope this were usefull for you. If you need something else, just ask!

(*) I use phasor~. Once it is configured to play at specific sample 
lenght and velocity, I send 14 (with some math), to start in that place: 
advanced.





On 03/12/13 03:22, Ron I. wrote:
> Hello - we are playing a metronome audio file at time intervals (bpm) 
> while simultaneously recording an audio track.  Currently we can't get 
> perfect sync between the two.
>
> We are using iOS, and I wanted to reach out to the PD community, to 
> see if there are any developers who can help with a consulting gig to 
> get the metronome and recording process synced, which is crucial for 
> the rest of our app!
>
> Thanks
> Ron
>
>
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