There are however some significant upgrades: Resonance control replaces the Deep switch, allowing you more control of the lower-end chunk studio quality digital Reverb instead of spring Reverb; there's a rear panel Pentode/Triode switch which drops power output from 100 Watt to 50 Watt which changes the sonic character and playing feel, and a rear panel series FX Loop. The flexibility of the shared five-way EQ section is increased further by a Tone Shift button which scoops the mid frequencies, making it ideal for modern metal styles. The DSL100H, with awesome tone and real flexibility, is incredible value for money.