Design a bass/guitar effects pedal

I am a sml,,l part time pedal manufacturer in California. I’m looking for an engineer/circuit designer who has experience with audio circuits. I am looking to design a bass guitar effect pedal that can generate a signal an octave above and below what the input signal is. There are several units on the market that do this already, just look up ‘octave Pedal’ if you’re not familiar with the concept. Past experience with Guitar Effects is always an advantage, but not necessarily a requirement.