mmm, recipes )
Also, this thread is a completely dead duck without this (thanks to kazakore from another thread ( Enabling The Formula Meta Device ) ):
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Are you saying, that since I do know how to say
renoise.song().transport.bpm = 110
that the Formula part could be used to say, read A + LINE
and the User part could be used to do
renoise.song().transport.bpm = Formularesult
?
How would I go about doing that?
These would be appreciated very much! 
Are you still not using Meta Devices a lot??
Basically you can create (amongst others) complexer LFOs, or LFOs that always have 4 cycles per pattern no matter how long the pattern, stuff like that. I used to make some chiptunes by typing in weird formulas, like sin(X+sin(X)) where X is something to do with LINEF/NUMLINES2PI - and then letting it control a DC offset and render the pattern. Voila a chiptune.
demo-formula.xrns
These kinds of waveforms are also what I mean by ‘complex LFOs’ - but usually, I’ll indeed just try using a couple LFOs with them bound to Offset or Amplitude or even Frequency of another LFO, throw some MMixers in etc.
tldr; I don’t really use it in a lot of songs, I did have a wobbly bassline with it once but I lost that xrns. It was fun to make, but because you can change only 3 params, I don’t know it’s still just a little bit made for the diehard…