Making analog synth

[MaestroS]

Hello, i started making an analog synth, and i have a few questions. So:

1. PSU should be built using linear regulators or switching power supply? Which way of making it is better in audio purposes?

2. MIDI-CV converter. I want to build multiple voices, so there should be also multiple cv-outs from uC, yup? How it should work when i press multiple keys? I think of building converted using some ARM uC and programming midi messages to UART receive. It just work by simply fast switching multiple uart mesages and sending them to uC when multiple midi keys are pressed?

3. Vco's sync. I want to use 3xVCO in one voice of the synth. Should i hard/soft sync them? Whats the purpose of soft/hard synchro?
Thats for now, thanks for help :p

[Grumble]

[elmegil]

Using 3 VCOs as a single voice, you generally get the "fatness" that is much desired without doing sync. The oscillators lightly beating against each other gives it this quality.

Sync, particularly hard sync, is more of an FM-like effect. If you're familiar with the song "Let's Go" by the cars, the main synth riff in that song uses hard sync, and there's a characteristic cutting edge to the sound. This is accomplished by changing the pitch of the locked VCO -- it stays in tune with the master, but the wave shape changes as it is changing the underlying pitch. There are probably youtube videos showing what this looks like on an oscilloscope.

[MaestroS]

Thanks guys!