Well the PSR-2000 will allow voice editing, but it's quite limited. A standard synth will allow at least 4 elements per voice, with features like velocity curves and so forth.. The 2000's voice editing lets you do some pretty decent things, but if your friend wants to dig into the sound and really twist it up, he might not like the 2000. Now if he likes the Triton, he'll want to look at the PA-80, and PA-60.... These boards sounds are Triton based, and I think they're pretty extensive in voice editing.. Several people here have the PA's and I know for sure Bluezplayer does and knows a great deal about the keyboard. As for the Yamaha PSR-9000, 9000 Pro, and Tyros, I'm not sure how they are.. They allow voice editing, but I'm not sure if they have full blown synth engines. One lower end arranger that I and Bluezplayer used to own was the MZ-2000 by Casio.. That keyboard had a killer synth.. You could really mess up a sound if you wanted to.... Plus I think someone said they've seen them selling somewhere for like $600 or less... I suggest your friend take a good look at the Korg PA series if he likes the Tritons sounds and synth engine. If he favors Yamaha I suggest he look at the PSR-9000, 9000 Pro, and the Tyros. Roland also has the VA series.. I've never played this keyboard, but many here have and own it as well and they can tell you how this one performs.. You might want to look at the GeneralMusic line up too..

Squeak

Squeak
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.