Your might want to take a look at the TLC 5940. It's a led-driving chip with 16 pwm outputs. Chips are daisy-chainable, and there is an arduino library.
https://www.sparkfun.com/products/10136

On 25/06/2013 22:53, Charles Z Henry wrote:
Are you sure you need PWM pins?  You'll definitely be paying for more *duinos if you are just using those.  If I were you, I'd think of another way to deliver a variable impulse to the hammers.

Chuck


On Tue, Jun 25, 2013 at 3:43 PM, Epic Jefferson <jeffreyconcepcion@gmail.com> wrote:
Hey guys, 

I've had progress building an Arduino-powered solenoid system for a controlling a piano's hammer mechanism (removing the keys) via pd. 
So far I've found the solenoid I want to use. Inline image 1
Does any one have experience daisy-chaining arduinos (or arduino mega's) to get more pwm pins, while using just one usb connection for controlling via pd? 

--
www.epicjefferson.com

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