ExEf (Extreme Effect) is an extremely powerful and flexible Real Time effect engine running on a PC under LINUX. It is designed to work with guitars, microphones and other instruments. It can run both in X Window System and command line. It supports both recording an post-processing. For easy start, try some presets!
All you need is:
# PC - Pentium MMX or above (Alpha may work as well)
# Full duplex soundcard
# Linux (FreeBSD may work as well)
# ALSA or OSS (mostly included)
# A mixer
You should also have X Window System with Tcl/Tk installed (mostly included).
ExEf was written by Tomas Olexa with help from Vaclav Hanzl in 2000 - 2003.
ExEf is freeware under GPL.