This is side "B" of the Duellist dual pedal released as a standalone effect. It's got several tweaks & added features from what's inside the Duellist, so not a direct clone, though pretty close.
Basically a Bluesbreaker/Prince of Tone with a clipping diode switch and a few different pre-clipping tonal options.
Full tracing journal: (includes Duellist and Soloist)
https://aionfx.com/news/tracing-journal ... -heavyhand
PCB:
https://aionfx.com/project/xiphos-amp-overdrive
King Tone Heavyhand
- aion
- Solder Soldier