there are silent step sticks. 1/256 micro stepping (this is internal only, externally they are still 1/16 so work 8 bit controllers, but runs quiet)
[www.filastruder.com]
There is also RRD Silencioso - 128 microstep driver - Pololu compatible, real micro stepping... needs a 32 bit controller for anything over 1/32 micro stepping.
[www.reprapdiscount.com]
and im sure dc42 will chime in with his reply to everything about upgrading to his controller any moment now.
[www.filastruder.com]
There is also RRD Silencioso - 128 microstep driver - Pololu compatible, real micro stepping... needs a 32 bit controller for anything over 1/32 micro stepping.
[www.reprapdiscount.com]
and im sure dc42 will chime in with his reply to everything about upgrading to his controller any moment now.