Hello everybody!
Can someone help me on this:
I've seen this SF2 at eBay http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320379728020&viewitem=&sspagename=ADME%3AX%3AeRTM%3AUS%3A1123&salenotsupported
selling from USA. I think it works with a power supply... But can work with european voltage 230 volts?  
thank you!!!!!!

You need to get an external wall wart power supply for the proper voltage in your country that matches the power rating (10.5-17.5 VDC) and the polarity (center contact positive) for the SF-2.  
 
Note that if you use the wrong polarity, you'll need to replace an inductor.

Do many use the SF-2 for guitar, or is it mainly for bass?
 
Todd.

I personally love the sound of an SF-2 with guitar, and I know I'm not alone.  I'm selling mine in the For Sale section because I just don't tend to use rack effects.