The MOEN MO-DM Distortion Master is superb for blues/rock. Featuring organic distortion that is very tubeville! Unlike some "tubelike" pedals that you just turn everything up and that is what you get, there are some options here. It is also capable of getting nicer tones as well when you want to blues it down a bit.

This effects pedal is perfect for a rock or blues guitarist. The distortion controlled by the Drive knob produces the classic smooth harmonic sound traditionally associated with blues and rock. The Tone knob allows the guitar player to suit his preference to a more bass or treble tone. The level is to crank it up where you end up in metal territory.

1. Level
   Output Level Knob
2. Tone
   Tone Knob, Sharpen by turning clockwise
3. Dist
   Distortion level
4. 1,2,3
   3 selectable Distortion styles

Features:

• Warm And Smooth Tone
  
• Rich Harmonics Produces Tube-like Sound
  
• Classic Drive/Tone/Level Knobs
• Solid Metal Enclosure
• True Bypass Stomp Switch
  

Model: MO-DM
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Although these pedals are designed for electric guitar, their analog design makes them compatible with most other electric instruments, including microphones.

Visit this link for information about all types of guitar effects and what they actually do.