From the spec sheet..."The PSR-S670 features two assignable live controllers..."

This looks very interesting, and hopefully we will see these assignable knobs on the S960 and S760 and even more importantly, they will wind up on next Tyros.

Formerly, these were only on the entry level PSR-E-series, and having "live" control over voice filter and resonance is very expressive indeed.

When I was doing Yamaha Arranger clinics, only a small percentage of users were doing the gig thing, but those using them had locked on to a great little tool for one man (and two man) jobs.

Regarding solo and duo acts in my area, there seems to be an increasing usage of MP3 players for accompaniment tracks, whether inbuilt to a keyboard (where they can also use styles and/or SMF) or stand alone units such as laptops.

Ian