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Soundgarden "Blackhole Sun" guitar lesson. Next, we're using the TECH 21 Roto Choir to mimic the fast Leslie speaker played by Kim Thayil. The Roto Choir is set to 'Biamped' mode to replicate the dual rotor sound of a Leslie 122, which gives the guitar a complex, swirling tone. Starting with Drop D tuning, the bulk of the verse stays on the high strings with triads that sustain into the cosmos. The chorus ramps down to the slow rotary speed and finally uses some drop D action with a hard hitting MXR Distortion III. One of the coolest chords with this tuning is D7no3, which contributes to this riff's moody sound. Enjoy your riff of the day guitar lesson!