Korg D1600 has large amount of effects for guitars to vocals. (reverb, compressor, gate, etc.........) Also have Boss GT-3 for extra guitar effects to add for difference. The TC Electronics Helicon voice prism is used for harmonies if needed to cut out overdubbing track usage on back-ups. It also has a wide range of vocal effects. I have an ART Dual 15-band EQ, and a DOD headphone amp distributor.