Hey everyone, this may be a stupid question but how do you get a pure sine wave on the Little Phatty? I just got one of these to play around with and I can’t figure it out for the life of me! The oscillators don’t seem to have it. I see the Triangle, Sawtooth and Square waves but no sine wave. SUrely there is a way right?
Thanks for the help.
Ryan
Triangle is the closest the OSC section gets. You can get a sine wave with the filter resonnace turned way up and the KB Amount adjusted appropriately to get it to track to the keyboard.
Set Osc to TRI.
Set filter pole to 4.
Set filter cutoff to zero (tri loses basically all of it’s harmonic content)
Set resonance to zero.
Play a note.
That’s pretty much a sine wave, albeit probably not a perfect one, but it’s extremely close.
Cranking the res full and bringing down the cutoff filter works too but doesn’t track more than a couple octaves accurately.
I may be wrong but why not using a square wave and filtering?.
No matter what the waveshape is because when filtering with a very low cutoff frequency you’re removing all the harmonics and having basically a sine wave.
(Actually, you’re lowering the power of the harmonics above the cutoff frequency so there will be very subtle, and even not noticieble, diferences depending on the waveshape.)
Of all the waveforms available this has the least harmonic content to start with prior to filtering. Since a sine wave has no harmonic content other than it’s fundamental, we definitely want to start with the least possible content prior to filtering.