"Leslie" rotating speaker LFO

[ferdinandstrat]

I did notice that flangers come close to that rotary sound more than chorus pedals though

That implies two things to my mind:

1) We want delays at the shorter end of what would be acceptable for chorus, or into the flanger range
2) Some feedback is probably acceptable or even a good idea (it typically wouldn't be for a chorus).

I can't see any way to determine these details beyond practical experiments. The only trouble with that plan is that different people have different tastes and opinions, so you tend to get several different answers. Basing yourself on some kind of "that's the physics of the situation!" approach gives you a justification outside of "I thought it sounded good".

Yeah which is why it's a good idea to have a chorus with manual and feedback controls........wait doesnt that basically make it into a flanger?

And yes, different strokes but this way at least you can get snobs off of your back 

[Steben]

Any flanger with some possible longer delays gives chorus sound. Andy Summers all the way... It does not render chorus obsolete, because dedicated Chorusses with wider delay spans give better vibrato options because of the bigger depth range giving higher pitching.
All depends which effect you want.

The feedback gives some slight resonance which makes for a better sim of a rotary with all the reflection going on. If you split in low and high you are very close. The pulsating tremolo effect is missing though. But that only applies to the modulated sound, not the dry signal coming through the cabinet.

[modj]

any updates*?

[ElectricDruid]

any updates*?

Well, it's still on my bench. The chip itself is pretty much done, I'd say. I've been playing with a couple of example circuits using it, and I'm not happy with those just yet, so I haven't released it.

One is a dual speed Tremolo, which uses the Fast/Slow mode switching to provide two preset rates/depths for a trem.
The other is a similar thing, but driving a OTA-based phaser with 4 swept stages and 2 fixed ones. I thought that might be quite cool with the speeding-up/slowing-down effect.

I also sketched out a full analogue rotary speaker simulation using two BBDs for separate high band / low band spinning craziness. This needs two ROTARYLFO chips, plus tons of filter, mixers, etc etc - it's a big circuit. Whether it is really worthwhile trying to build such a thing entirely analogue seems like an open question to me at this point, having seen what's involved!

I'm also trying to finish another envelope generator design, and that's first up, so I haven't worked on the LFO for a bit. Hopefully I can get the envelope done and then get back to it and get it finished off too.