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#1 |
Registered User
Join Date: Jul 2024
Location: France
Posts: 13
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Advanced Paula Features
Paula was mainly used to play samples and IIRC very occasionally wavetables.
However, it was capable of more than just sample playback. It should also be capable of AM and FM synthesis. There is an order you can set the channels to modulate each other with modulation being AM, FM or both. The FM modulation is 14 bit but being read as a pair of bytes means it'll only run up to 14KHz. The AM modulation is the same but it's only 6 bit out of the 16 bits read. You can chain the 4 channels together so it should be able to do something like 4 operator FM synthesis (or AM or AM/FM). Did any Amiga software ever do this? |
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#2 |
Registered User
Join Date: Jan 2015
Location: australia
Posts: 568
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FMsynth? (it's on aminet)....there was (at least) one other, Synthia...
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#3 |
HOL/FTP busy bee
Join Date: Sep 2006
Location: Germany
Age: 46
Posts: 32,254
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This thread might be an interesting read (and watch): https://eab.abime.net/showthread.php?t=114590
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#4 |
Alien Bleed
Join Date: Aug 2022
Location: UK
Posts: 4,692
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Technically it would be Period Modulation, not Frequency Modulation. It's an important difference because the period value is inversely proportional. What people usually think of with FM, i.e. Yamaha OPL etc. is also a different mechanism again, Phase Modulation. This is a numerically (and computationally) better behaved approach.
The Period Modulation is not especially useful musically but you could presumably get some interesting clangs out of it |
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#5 |
Registered User
Join Date: Apr 2012
Location: france
Posts: 266
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there is good soft synths on the amiga, if you want the blip bloop blop feeling. Aegis, octamed, ahx, etc...
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#6 |
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Join Date: Feb 2008
Location: Northampton/UK
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#7 | |
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Join Date: Mar 2022
Location: Birmingham, UK
Posts: 161
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Quote:
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#8 | |
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Join Date: Jul 2024
Location: France
Posts: 13
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Quote:
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#9 | |
Registered User
Join Date: Jul 2024
Location: France
Posts: 13
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Quote:
So, it does appear to have been used, but mostly as a ringmod like effect as far as I can see. I'm wondering has it ever been used for synthesis, as in FM synthesis? |
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#10 | |
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Join Date: Mar 2022
Location: Birmingham, UK
Posts: 161
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Quote:
![]() As all the various FM softsynths just seem to render samples, it doesn’t appear that this has ever really been used for synthesis. I find the “FM” very unpredictable, even with two lots of the same waveform, and I feel that very careful cycle accurate data would need to be used to get that working. Da Jormas struggled with this too. The AM is far more usable on any pair of waveforms, of course. Fun news though, I have requested that this gets added to OctaMED Soundstudio and turned on per step (I hope it can be done!) so hopefully this feature will inspire a whole new breed of Amiga music. |
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#11 | |
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Join Date: Sep 2009
Location: Norway
Posts: 1,724
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Quote:
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#12 | |
Registered User
Join Date: May 2017
Location: Munich/Bavaria
Posts: 2,467
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Quote:
Same way as distance is not speed. That's not just semantics but physics. |
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#13 | |
Alien Bleed
Join Date: Aug 2022
Location: UK
Posts: 4,692
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Quote:
When the input phase is increasing linearly, the effect on the carrier is as if it's running at a higher frequency. If the converse is true, it's as if it's running at a lower frequency. Thus phase modulation can achieve true FM, but it's not what makes it useful as a means of creating complex spectra. |
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