# tempo to milliseconds?

Home Forums General Programming tempo to milliseconds?

Tagged:

This topic contains 2 replies, has 1 voice, and was last updated by  human fly 11 months, 4 weeks ago.

Viewing 3 posts - 1 through 3 (of 3 total)
• Author
Posts
• #73591

human fly
Participant
• Topics: 123
• Replies: 1051
• Total: 1174
• ★★★★

;o)

tempo to milliseconds… how am i going to make that knob…

tempo = bpm/beats per minute.
60,000 milliseconds per minute…

cannot have inverted values ie: high to low, on Ctrlr
controls – so i can’t bodge it and just have decreasing mS
anyway … so.. given a tempo range of, say, 30 to 240 bpm …
taking 120bpm as a reasonable place to start…
this will do:

How to convert ms (milliseconds) to BPM (beats per minute) and vice versa

so i have to divide 60,000 by the BPM to get the milliseconds.
simple. (a little bit more complicated to get that to pitch an
oscillator to produce a bpm-synced LFO, but that’s for some
other time)

now, to write the method… !

#73593

human fly
Participant
• Topics: 123
• Replies: 1051
• Total: 1174
• ★★★★

erm.. so 60000/120(bpm)=500 … and i want 4 steps
per beat, so 500/4 =125ms per callback. …?
running at 100ms right now, looks pretty alright 🙂

#73594

human fly
Participant
• Topics: 123
• Replies: 1051
• Total: 1174
• ★★★★

cool, it works – but i cannot get any ‘realtime’ variation
of tempo: once it starts, thats the tempo until i stop it,
change the tempo knob, and run it again:

``````local base = 60000
local bpm  = panel:getModulatorByName("tempo"):getValue()
-- [tempo range is 30-240] --
millisec = base/bpm/4

--start timer
timer:setCallback (1, runCallback)
timer:startTimer(1, millisec)``````

would i have to start timer, then stop timer, then restart,
for each step?(!!) – or could a function be inserted in
startTimer() that monitors ‘tempo’ value ? (s’pose not…)

Viewing 3 posts - 1 through 3 (of 3 total)

You must be logged in to reply to this topic.

There is currently 0 users and 27 guests online
No users are currently active
Forum Statistics
Threads: 2,165, Posts: 15,267, Members: 21,102
Most users ever online was 10 on October 29, 2018 2:54 pm