On most instrument amplifiers if you plug a low impedance mic into a 1/4" input without a transformer it will technically work but you will have to turn the volumn all the way up and it still will be barely audible.m Thats why I always use a transformer but I guess in this situation with a tyros it is different.
When I worked at the music store the kids would always try to cut corners and use a 1/4" cable to plug into an amp and the next day they'd be back to buy the transformer.
Some of the amps especially the keyboard or acoustic amps have mic inputs that will work with a low imp. but use a 1/4" to do it.
My roland kc does.

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[This message has been edited by mikeathome1 (edited 11-12-2004).]