Here we've got a Dumble style drive, and a very good one at that. Hao stuff is highly regarded for quality; this one sounds terrific. The colour and tone knobs give you a two-pronged attack to get the tone where you want it, plus there's a sweet touch-sensitivity and harmonic complexity on tap as soon as you turn it on. Leave it on?

Model: Hao Rumble Mod Overdrive/Boost
Made in: Japan, recent model 
Type: overdrive/boost, Dumble voiced
Power: regular 9v negative supply
Equivalent new street price (approx): n/a
Mods: none
Accessories: original box and docs
Condition notes: minor marks only, excellent condition