To quote from the GW-7 manual:

"The Favorite Tone function lets you register up to ten Tones to each of the ten category buttons [PIANO]–[DRUMS], regardless of the category of the Tone or whether it is a Preset Tone or a User Tone. For example, if you register the Tones you use most frequently, you’ll be able to select them quickly in a live performance situation."

In other words, you can store a total of 100 preset or user tones, and each tone can be stored in whatever instrument category you choose (if you have more ethnic sounds than will fit in either of the World categories, you can store the extra tones in the Piano category, if you so choose). Nice!

By the way, my main useability complaint with the GW-7 has been the data wheel...I prefer the ones on my Fantoms because of the "finger indentation" (makes it easier to spin with one finger). I removed the data wheel from the Fantom X and it fits and works perfectly on the GW-7! Now I've got to find an extra wheel, hopefully without having to order one from Roland!

Michael