The design aim with the True Overdrive 1 was to emulate the way valve circuitry behaves, so that the sound cleans up very naturally as you back off the guitar volume control or play quieter.
Designed to allow the guitarist to produce familiar amped tones without the need for an actual amplifier, Radial’s ToneBone JDX Direct Drive emulates the tonal coloration of a guitar amplifier/speaker combination.