triggering samples

[jessethom@canada.com]

Hi guys,

Does anyone know of some good gear to use for
triggering pre-recorded samples of anywhere from 2-30
seconds in length, using a pedal or footswitch?
(And using something that can hold quite a lot of such
samples)?

For instance, during a live solo performance, you are
playing your guitar and singing, and when you get to
the chorus you want to hit a pedal that will trigger a
pre-recorded vocal harmony.

Any thoughts would be most welcome.

Thanks,
-Jesse