Boss Overdrive simualnt analog distortion of a tube amp.

UTILIZATION

Simplified Deployment:
- Drive: saturation intensity.
- Tone: tone color saturation (dosage bass / treble).
- Level: level of output.

SOUND QUALITY

Very good dynamic rendering.
Very versatile pedal.
I use it mainly mild boost and overdrive in addition to the overdrive of my Marshall Valvestate for warm distortion, efficient, doing well out harmonics.
I play an Ovation Breadwinner. In clear channel, the crunch is superb. In overdrive, by adjusting the knob at the bottom, the rhythm is clear and dynamic. By increasing the knob, the sound is warm and well saturated round.
Only problem (met with any overdrive pedals a bit too far): the breath .... With an adequate noise gate (ie. the decimator) is perfect.

OVERALL OPINION

I use it for 1 month. I had used before in a DS-1 boost and a TS-9 overdrive classic. I bought the TS9 after long hesitation between it and the SD-1. I was quite disappointed with the TS9. This is a great overdrive pedal but too oriented blues. She excels in clean (especially with microphones Texas), but with distortion or boost, I found the sound too "loud" and too cold. The SD1 gives me what I wanted from an overdrive pedal with distortion: the sound is warm and round as I want. Dynamic rendering stays true despite the high volume distortion. This is the perfect overdrive for rock (the slight crunch to the big heavy rhythm).
The value for money is excellent (especially compared to a TS9). This choice I would do without hesitation.