If you mean milliseconds to bpm and vice versa:
minute = 60,000 ms;
bpm * ms = 60,000;
bpm = 60,000 / ms;
ms = 60,000 / bpm;
[120
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[t b f]
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[60000(
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[/ ]
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[500 \
Send this to the right inlet of [metro]. Then connect a counter [int ]/[+ 1]/[% 16] (outlet of the modulo to right inlet of [int]) to the outlet of [metro]. That then counts from 0 to 15 with an interval of 500 ms.
--Funs