[PD] write tempo change with [midifile]?

Martin Peach chakekatzil at gmail.com
Sun Feb 11 01:48:23 CET 2018

On Sat, Feb 10, 2018 at 1:49 PM, tim vets <timvets at gmail.com> wrote:

> I seem to be getting closer
> [255 81 3 $1 $2 $3( seems to do the trick, (the 3 was necessary to
> designate the 3 following bytes...)
> still not sure why [255 81 3 7 161 32( does not result in 120bpm but
> "120qpm" and 80bpm...

Probably because numbers greater than 127 must be formatted in
'variable-length quantity' form, where the number is broken up into 7-bit
pieces and all the pieces except the last have the high bit set, so decimal
500000 in hex is 7A120, or in binary 1111010000100100000, becomes 10011110
11000010 00100000, or 158 194 32 (if I didn't make any mistakes along the
way). Using calculator in programmer mode is useful here.
 I need to add a meta method so you can write meta events without having to
do that.

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