To produce his guitar sounds, Morello chooses various effects pedals. During his tenure in RATM, he used a Dunlop Cry Baby, a DigiTech WH-1 Whammy, a Boss DD-2 Digital Delay, a DOD EQ pedal (set flat and just used to boost the volume during guitar solos or particular rocking moments), and an Ibanez DFL Flanger. Around the time of "The Battle of Los Angeles" he added a Boss TR-2 Tremolo pedal (which can be heard on "Guerrilla Radio"). For Audioslave, Morello replaced the Ibanez Flanger with an MXR Phase 90. His amplifier of choice has always been a 50-watt Marshall JCM 800 2205 and a Peavey 4x12 cabinet. While the Marshall amplifier has two channels, he only uses the overdrive channel, and simply lowers the volume on his guitar to get cleaner sounds.