★ Compared to the original SD-1, it's more hi-fi, has higher gain, better sound separation, and the weakness in the low end has been improved. Based on the MOD from Company A, it further incorporates the original MOD. Similar MODs to the TS-9/808 have been applied, allowing for the reproduction of compression and nuances like a Tube Screamer. ★ The 3-way switch on the right side of the unit selects the clipping diodes: normal silicon asymmetrical arrangement (same as the original) at the top, Governor mode LED symmetrical arrangement at the bottom, and a comp-cut mode with no compression at the center. ★ The mini-switch on the far left of the unit switches between normal SD-1 mode at the bottom and distortion equivalent to Keeley SD-1 Stacked Mod (twice the normal) at the top. ■■TWIN DRIVE Mode■■ The footswitch added on the top of the unit switches to the knobs on the side of the unit. The left knob (GAIN2) and the right knob (LEVEL2) can be used to boost the sound, such as for solos. Practical use includes setting different settings for backing and lead and switching instantly. The normal ON-OFF check lamp is ultra-high brightness BLUE, and the check lamp switches to ultra-high brightness RED in BOOST mode. ★ Equipped with a JRC4558DD OPAMP. It has a socket, so you can freely replace it. Compatible with both 9V batteries and AC adapters. ※ May end early as it is also listed on other sites. Type...Electric Guitar Manufacturer...BOSS