MOTM

thanks to everybody who took the time to reply!!

apparently it matters what resistance the pedals have??

quote ernie ball's pedal faq:
"An expression pedal controls the amount of voltage that allows 
certain functions, such as, delay, distortion levels, volume, etc. in 
a keyboard or an effects processor to perform to whatever parameters 
the user sets it up to do. Our pedal may work as an expression 
pedal , but the manufacturer usually suggests what type of pot needs 
to be used, 500k, 250k, 25k, etc. in a pedal, keyboard, or an effects 
processor. The pedal might require a more sophisticated design, 
contact the manufacturer to determine what type of pedal is 
necessary." 

the ernie ball pedals are available with different resistance values: 
500kohm, 250kohm, 25kohm; and, according to the ernie ball website:
500 and 250 kohm is "suitable for the audio path of passive 
instruments", and 25kohm "for the audio path of active instruments or 
buffered effect returns".

greetings,
chef!

the yamaha fc-7 is rated at 50 kohm +-30%, if i understand their 
manual correctly.

the roland pedal i have no info about (can't find it on their sites).

so: which resistance value do i need/want?