tempo to samples conversion?

Nov 8, 2010 at 11:49pm

tempo to samples conversion?

I’m using Max as a host and REAPER as a slave right now, and I’m trying use a “position $1″ message to set the start position in REAPER, but I dont know a proper tempo to samples conversion method.
As an example, if I have REAPER’s tempo set to 60, and I have a song thats 4 beats long and I want to set the song to start on beat 3, what conversion method would I use?

Thanks.

#53209
Nov 9, 2010 at 12:58am

The duration of 1 beat is 60/BPM seconds.
The number of samples per second is defined by the sample rate SR.
So the number of samples per beat is (60/BPM)*SR.

Example: BPM=120, SR=44100.

(60/120)*44100 = 22050 samples per beat.

#191216
Nov 9, 2010 at 12:58am

Look at the translate object

#191217
Nov 9, 2010 at 12:29pm

Note however that translate doesn’t calculate the samples.
But you can translate beat to ms and then multiply with sample rate (in kHz).

#191218
Nov 9, 2010 at 4:22pm

Yeah translate has samples as both input and output format options.

-A

#191219
Nov 9, 2010 at 7:40pm

Oops, my bad! Thanks for clarifying.

#191220
Nov 9, 2010 at 7:42pm

There’s a bug in it though. It only works at 44.1k SR in Max 5.x. The bug is one of those nasty “but we have to rewrite the whole way MSP works in order to fix it” type things. Hopefully it will get some love for the next major revision.

-A

#191221

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