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Annoying buzz tone on the MPC4000 when using the AMP envelope
Old 4 weeks ago
  #1
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addi307's Avatar
 

Annoying buzz tone on the MPC4000 when using the AMP envelope

Hey guys,

after a few years I decided to go back to hardware and bought back my beloved MPC4000. Now I noticed something funky: when using the AMP envelope on bass sounds, the decay to be exact, you can hear an annoying buzzy tone (sounds like a bitcrush effect). The sound is only apparent when the decay is short, i.e. below 65...

I tried everything: lowering the volume, change velocity routing etc. Is this a known bug?

All best,

addi307
Attached Files

MPC4000 Decay Ring Buzz Tone.wav (1.26 MB, 171 views)

Old 4 weeks ago
  #2
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gentleclockdivid's Avatar
 

Try to replace the kick sample with a dc sample ( positive cycle of a square only ) , and see if it also happens

Old 4 weeks ago
  #3
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addi307's Avatar
 

[QUOTE=gentleclockdivid;14155588]Try to replace the kick sample with a dc sample ( positive cycle of a square only ) , and see if it also happens

Thank you for your advice! Can you tell me, how I get a dc sample? Turns out my Peak doesn't produce exact square shapes...
Old 4 weeks ago
  #4
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gentleclockdivid's Avatar
 

Just draw them in audio editor ( positive energy only ) and load into the mpc
here you go ( mono omly ) ,and 44100 samples long
Attached Files

pos.wav (172.3 KB, 86 views)

Old 4 weeks ago
  #5
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addi307's Avatar
 

Hey,
I tried it out and unfortunately the noise is still apparent. The buzz is around 11k and yes you can filter it out with a LPF.
Old 4 weeks ago
  #6
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Uncle Dieppe's Avatar
Seeing as you've not used the MPC for a long time,have you tried opening it up and reseating the RAM sticks??they could have become loose or corrupt.

I've got a 4K and normally if there is distortion or some form of issue with samples(unless the samples are the problem)just reseating the Ram Sticks has sorted the issue,or it could be the RAM sticks have become corrupt somehow,I'm not aware of any known bugs with the amp,not experienced the exact issue you describe,any symptoms with samples have been resolved by me reseating the ram sticks after eliminating the samples of being the problem themselves.

I also have a Roland MV8800 and had issues with distortion on samples when the RAM modules somehow had become corrupt(cheap ram) after it had been sat unused for a few years,replacing the RAM modules with some fresh ones resolved the issue.

Worth a shot to investigate the RAM sticks...
Old 4 weeks ago
  #7
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addi307's Avatar
 

Wow, never thought about that. I will give it a try! Thank you
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