How do you usually layer them? I would do the following:
- different sound for each layer trying to use something that would occupy different frequencies in the spectrum to not over-charge the high-end
- different octaves / melody pattern for each layer - usually 3 layers with 3 different octaves
- a bit of stereo widening on the top layer (highest octave)
- on the group channel: compression, eq
I've read few times that is common practice to keep the main layer mono or close to mono, do you agree?