strophlex Posted November 21, 2011 Report Share Posted November 21, 2011 Hi I am making some noise with my sammichFM. I modulate op4 with op3, both sine and apply a slow attack to op3 with the envelope and I hear some pretty nasty distortion. It sounds like zipper noise. The same happens if I make the attack of op3 faster and modulate it with an LFO with sine shape. Did I do something wrong or is it a common problem I just have to live with? Is there some methods to minimize it? I know FM can cause aliasing if to many operators modulate each outher, but do I also have to keep track of levels to avoid digital overflow (amplitude)? I will upload audio sample soon. Quote Link to comment Share on other sites More sharing options...
strophlex Posted November 21, 2011 Author Report Share Posted November 21, 2011 (edited) http://soundcloud.com/herr-ur/mbfmzipper Edited November 21, 2011 by strophlex Quote Link to comment Share on other sites More sharing options...
jojjelito Posted November 21, 2011 Report Share Posted November 21, 2011 (edited) If it walks like zipper and quacks like zipper it is a duck? Sounds very much like zipper noise, or when I change waveforms on the fly with the data slider on my Prophet VS... Edited November 21, 2011 by jojjelito Quote Link to comment Share on other sites More sharing options...
strophlex Posted November 25, 2011 Author Report Share Posted November 25, 2011 (edited) Cmon... Can anybody with an FM comment on this? Did you make the same observation? If so did you find a way to minimize it? If not, do you have any idea what I did wrong? Edited November 25, 2011 by strophlex Quote Link to comment Share on other sites More sharing options...
toneburst Posted March 29, 2012 Report Share Posted March 29, 2012 Did you get to the bottom of this, in the end? I haven't used my SammichFM for a while, but I didn't notice anything like this last I checked. On the other hand, I did get some pretty nasty digital distortion artifacts when I first put the thing together. They were solved by re-melting the solder on the SMD chips. You could try that, if you haven't already. Just a thought. a|x Quote Link to comment Share on other sites More sharing options...
strophlex Posted March 29, 2012 Author Report Share Posted March 29, 2012 Did you get to the bottom of this, in the end? I haven't used my sammichFM for a while, but I didn't notice anything like this last I checked. On the other hand, I did get some pretty nasty digital distortion artifacts when I first put the thing together. They were solved by re-melting the solder on the SMD chips. You could try that, if you haven't already. Just a thought. a|x Thanks for the reply. I haven't managed to solve this. Thought it was just the way the chip worked since nobody had a solution. Did you listen to the audio samples? Is it the kind of artifacts you experienced. Quote Link to comment Share on other sites More sharing options...
Thomasch Posted March 29, 2012 Report Share Posted March 29, 2012 Thanks for the reply. I haven't managed to solve this. Thought it was just the way the chip worked since nobody had a solution. Did you listen to the audio samples? Is it the kind of artifacts you experienced. This would be my first checklist: - maybe the audiodriver from your soundcard runs nuts, change buffersize, or deactivate other Plugins if to free CPU and RAM - if possible change to another soundcard or a different input. - try different Outputs on your MBFM - reduce the volume in MBFM Menu Quote Link to comment Share on other sites More sharing options...
strophlex Posted March 30, 2012 Author Report Share Posted March 30, 2012 I will double check the other outputs and try the volume. The synth is not connected to a computer, so that rules out all sound card issues. Thanks. Quote Link to comment Share on other sites More sharing options...
Imp Posted March 30, 2012 Report Share Posted March 30, 2012 I can recreate this behaviour, my sammich does that too. It happens with too high volume of the modulating OP. You can reduce the volume (of op3 in your case) and use a higher multi instead, to get almost similar overtones. Quote Link to comment Share on other sites More sharing options...
strophlex Posted March 30, 2012 Author Report Share Posted March 30, 2012 Thanks Imp. I will try that. Quote Link to comment Share on other sites More sharing options...
strophlex Posted March 31, 2012 Author Report Share Posted March 31, 2012 It happens with too high volume of the modulating OP. You can reduce the volume (of op3 in your case) and use a higher multi instead, to get almost similar overtones. Thanks! This did the trick! I am just not good enough with FM yet, but this was a good lesson to learn. Quote Link to comment Share on other sites More sharing options...
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