I've encountered an annoying firmware playback bug on my older CDJ-200s. No typo here, I really mean the older 200 units :)
The problem is: Only when using MP3s, about 80-90% of the time, every time playback is started (Play/Pause button) -- or everytime a loop repeats using the looping functionality -- after just a few seconds of playback of any track, the tempo automatically accelerates by about 2 bpm for a few seconds (as if someone had nudged the pitch bend in the "+" direction), then after a couple seconds, returns to its expected value (as if someone had nudged the pitch bend in the "-" direction).
The whole time, the tempo slider is at 0% and never moved.
The whole time, the tempo range is set to +/- 6%.
The whole time, Master Tempo is turned ON.
The whole time, a track encoded as an 320kbps MP3 by LAME is playing on a Sony CD-R disc that I burned myself.
My ears noticed this as I recently started using my older CDJ-200s again a bit -- but this time with MP3s burned on a CD-R instead of WAV burned as an audio CD-R... and the beatmatching was often being screwed, and I couldn't understand why, until I pinpointed it to this.
If I use the exact same track, but dumped as WAV, with a Sony CD-R burned in the exact same burner but as an audio CD, this problem never shows up. Tempo is perfectly stable with a Sony CD-R playing the WAV track (as an audio CD).
FYI: Using the exact same CD-Rs in my CDJ-1000mk3s (F/W MAIN v2.20) shows no problem at all, whether in MP3 or WAV (audio CD) format. Looks like this is an issue specific to the CDJ-200 when using MP3s only.
==> I did a quick search in the forums and it appears that the latest firmware version for the CDJ-200 would be v1.40. Is that right?
I'm currently running version v1.30, and I'm hoping that it would have been fixed in v1.40.
==> Could you provide detailed instructions on how to upgrade firmware safely? (e.g. download image, verify authenticity of downloaded file, how to burn CD-R, keys to press on CDJ to upgrade, etc).
Thanks a lot in advance!