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re: fm

2002-05-10 by spaceanimals

fm=frequency modulation With simple fm you get a vibrato. Set the
sync/fm to just fm turn the fm amount just a little-maybe 2 or 3. For
a normal sounding vibrato use LFO 1 as the source and use a sine
wave. For something a little more spacey, set the LFO Delay to about
20 and play a sustained patch. Then set the LFO to s/h. This will
give you a normal sound that then drifts out of tune in an odd and
musical fashion.The more you turn up the fm depth, the weirder the
sound gets. Eventually the sound gets totally trashed. FM depth is a
great control for free eg. Also, the faster the LFO the wilder the
sound.

Now when you use osc sync one oscillator controls another for a vocal-
like timbre. You can apply the vibrato to both the master and the
slave, just the slave, or just the master. I usually set the fm to
control the slave. This brings in some nice evolving overtones
without trashing the central pitch.

Turning the Frequency modulation source knob while playing will
change the sound radically.

There's two frequency modulation sources. One affects the frquency
modulation. The affects the first modulation source. A nice use for
this is to have an envelope for your LFO.

Be careful when you use the modulation matrix so you can have knobs
or ribbon controllers affect the fm. Sometimes the fm winds up
getting stuck at a really setting. Then you need to just turn it back
down to where you had it in the first place.

Rainbow Jimmy
http://www.spaceanimals.com
http://www.mp3.com/spaceanimals

fm

2016-01-02 by jim.alciere@...

I get stuck on this periodically. My apologies. I can use VCO 2 to modulate the frequency of VCO 1 for 2 op fm synthesis. Normally with fm synthesis there is a carrier and a modulator and the volume of the modulator will change the tone.

So is the fm amount knob more for vibrato, and the fm source 2 more for fm synthesis?

Thanks

Jimmy

Re: fm

2016-01-04 by jim.alciere@...

I'm home. I turned on the AN1x. Here's what I found out:

With the synth set at fm only.

1. I can use VCO 2 to modulate the frequency of VCO 1 for 2 op fm synthesis.

Yes. The manual says this is not two op fm but it is.

2. Normally with fm synthesis there is a carrier and a modulator and the volume of the modulator will change the tone.

Changing the volume of the modulator will change the tone, but it's subtle.

3. So is the fm amount knob more for vibrato, and the fm source 2 more for fm synthesis?

With the fm amount knob set to 0 you get no fm.

Using VCO 2 as the fm modulato and changing the tuning of VCO2 gets wild results. Changing the edge of VCO 1 and 2 gets interesting results. Pitch envelope also. Won't be in tune, but sounds awesome.

I still like to use the sync +fm slave. The master provides the tuning--the synth will be in tune. The fm will cause wild and weird harmonics on the slave wave. A nice digital sound I can only get on the AN1X.

re: fm

2016-01-25 by jim.alciere@...

I found out the DX7 used something called "through zero" frequency modulation. No idea if that's what the AN1X is doing.

Jimmy

Re: fm

2016-01-26 by Daniel Boles

DX7 and all other Yamaha "FM" synths actually use phase modulation for various reasons including vastly improved pitch stability, not to mention computational ease. The AN1x probably does too, though it clouds the workings by reducing them to a few, differently named parameters. There might be other differences to suit the 'analogueness' of the AN1x if it's trying to emulate the FM in prior analogue synths rather than the DX.