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normal Largo audio rate FM modulation

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3 years 9 months ago #1 by anykeystudio
Hello Ingo and developer team.

I have a question concern the Largo FM modulation for the oscillators when doing audio rate modulation. I only seam to get noise out of audio rate modulation and noting like simple FM syntheses sound like (DX7, u-he Zebra, etc). Vibrato with a slow LFO works as supposed but the result when using a oscillator is sub-par.

Maybe I am doing it wrong or the Largo was never intended to do audio rate FM modulation ?

I am using 1.5.1 on Windows.

Cheers.

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3 years 9 months ago #2 by Øystein67
The Yamaha DX-synths actually use phase modulation, setting up frequency ratios work a bit different on FM. You can find frequency ratio tables for FM and RM at this site: www.carbon111.com/mwxt.html

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3 years 9 months ago #3 by anykeystudio
Thanks for the link, so the hint for microwace II/ XT works for Largo. I'll give it a try.

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3 years 9 months ago #4 by Øystein67
This trick should work on all Waldorf synths with a sineshaper drive curve:

1. Use a saw/ramp up waveshape for osc1, route it to filter1.
2. Filter1 open, shaper/sineshaper drive curve.
3. Adjust drive amount until the output becomes exactly a single cycle sine.
4. Use any waveshape you like for osc2, route it to filter1.
5. Adjusting the volume of osc2 is now the same as adjusting the volume of an operator in a 2-operator pair. The carrier in this case is a sine.
6. Set the filters to serial configuration. The saw/ramp up adds a fair bit of ripples in the transition between cycles, use filter2 to remove the nasty spikes.

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3 years 9 months ago #5 by Øystein67
An alternative method which allows for a greater range of PM modulation:
1: Use the filters in serial configuration.
2: Filter 1 uses the pickup2 drive curve to massively amplify the input signal.
3: Use a saw/ramp up as input, volume at about 1/3.
4: Filter 2 uses the sine-shaper drive curve, adjust drive amount until you get a full period sine.
5: To remove the ripples, use fx1 distortion as a LPF.
6: Use osc1 and 2 as PM-modulators. Make sure that all oscillators are set to 0 degree phase.
The volume range of the modulator(s) is now increased relative to the carrier (saw/ramp) so you will get a much greater range for PM-modulation :-)

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3 years 9 months ago #6 by anykeystudio
Great will check that up, thanks.

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