Good points, Squeak. I've been going back and forth trying to decide between the Casio WK series and an older PSR-thousand series model, and that Tone With Wave feature was quite enticing. I finally went with a PSR2000 I picked up on eBay, but it was a tough call. Especially considering the bang-per-buck ratio on those Casios. I still might pick up a Casio CTK-691 some day for a travel keyboard, which uses the same sound engine as the WK series, but in a smaller 61-key format.