DyLaw
Hi,
I’ve just bought the SC3900 and when I put CDs on the 2 players the BPM is constantly moving a little bit up and down! When I press BPM lock, the BPM is not moving on the screen but 2 same track with the same BPM and it doesn’t match.
I have the last update and the platter is in MID.
Does someone can help me please?
Thanks!
DJ_Boothe
Its normal for the BPM to constantly adjust either by small variances eg: 125.6 to 125.5 to 125.7 over and over again.
It’s also normal for some BPMs to double and half eg: 120bpm might drop to 60bpm during an instrumental break or rise to 240bpm during a crescendo or fill-in
Some other makes get around the constant visual changes to BPM by only having the BPM display visually update every 30 seconds or so, but that’s only a workaround.
Besides use the BPM read outs as a rough guide - it should be a DJs ears doing all the work.
DENON
Hi DyLaw, BPM Lock does just that, it wont change/update until the track is changed. Same as when using the TAP feature.
Welcome to the forum.
Please update your firmware then try again:
It may also be your CD-R type media DyLaw
Hi There!
Problem solved!!! 
It was the update version of the firmware!!!
Now with the latest vesrion it works perfectly fine, the bpm in now stable…
Thanks!