Subject:OT - Tempo measurement figures

Posted by: PeterWright

Date:11/9/2008 9:32:44 PM

I have a JamMan Looping Pedal, and it records tempo using figures such as 22970.

Does anyone know how this relates/can be converted to Acid bpm Tempo such as 105 ?

Thanks

Subject:RE: OT - Tempo measurement figures

Reply by: JohnnyRoy

Date:11/10/2008 5:02:07 AM

That's a strange number. I checked the user's manual and it has nothing about this. As you may know, the 105 in ACID means 105 Beats Per Minute which is the universally accepted way to express musical tempo. You should probably contact DigiTech support and ask them how to convert their number into Beats Per Minute.

Maybe that number is expressed in hundredths in which it would be 229.70 BPM or thousands in which it would be 22.970 BPM? Do either of those feel close to the tempo you are experiencing?

~jr

Subject:RE: OT - Tempo measurement figures

Reply by: jumbuk

Date:11/10/2008 5:14:31 AM

Well, bpm like Acid uses is obviously the "standard" way musicians record tempo, even before computers were invented (bpm=beats per minute).

Perhaps the JamMan is using milliseconds per MIDI tick as a unit? Does a higher number produce a faster tempo or a slower tempo?

Subject:RE: OT - Tempo measurement figures

Reply by: PeterWright

Date:11/10/2008 5:43:49 AM

I've just started using backings composed in Acid and transferring them to the JamMan pedal - it works really well. The issue of tempo came up purely out of interest, because each Loop created ON the JamMan pedal is saved as a mono file called LOOP.wav, and in the same folder is an XML file which includes a line with tempo information, e.g. "tempo 22970"

I think this file only comes into play if you want to use the pedal's built-in rhythm function, which playes a click or drum track if required. When I make a loop in Acid, it will usually have a drum track, so I never use the pedal's tempo side.

I just wondered how this strangely long number related to bpm. Perhaps, as you suggest, it refers to milliseconds. (Johnny - it's definitely not 22.970 bpm - the 22970 was roughly equal to 105 bpm, but not exactly.)

Subject:RE: OT - Tempo measurement figures

Reply by: Chienworks

Date:11/10/2008 10:39:41 AM

I wonder if it's samples. 22970 out of 44100 is 115.19376bpm. 22970 out of 48000 is 125.380932bpm.

Subject:RE: OT - Tempo measurement figures

Reply by: MarkWWW

Date:11/10/2008 11:42:47 AM

Yes, its the number of samples @ 44.1kHz (The JamMan works at a fixed rate of 44.1kHz).

It's explained (not very well) here. The calculation he uses is rather confusing but if you work it out you will see that it is just the number of samples.

Mark

Subject:RE: OT - Tempo measurement figures

Reply by: PeterWright

Date:11/10/2008 3:38:37 PM

Thanks for that - all is now clear. Tempo = 44100 * 60 / BPM