ARP Quadra

The ARP Quadra was one of Tony Banks' keyboards.

He began using the Quadra around the time of the Duke album, initially alongside an ARP 2600. This was his go-to synthesizer for lead lines - processing the sounds with a fuzz box, as heard on songs like "Abacab". He had also experimented with triggering the ARP Quadra with a Linn LM-1 drum machine on the Fugitive soundtrack and "Mama" from the Genesis album, to generate a rhythmic pulse.

As to how he did this, this was probably via a Kepex noise gate... However, this KVR forums post claims that Tony's ARP Quadra had a special "gate in" modification, where the voltage pulses from the Linn were fed in and it re-opened the filters every 16th note...

Live, a Korg WT-12 Chromatic Tuner was used to keep the Quadra oscillators in tune.

By 1986, the ARP Quadra was fitted with MIDI for the Invisible Touch tour.