Tsunami is a 4 OSC polyphonic synth
OSC 1+2 goes thru Filters 1+/or2 (choice) then amp env1
OSC 3+4 goes thru Filters 3+/or4 (choice) then amp env2
each OSC pair can therefore have 2 diff filter env settings for more interesting sounds.
LFO for OSC1+2 and OSC 3+4, global Chorus and MOD section, and Pan for each pair of OSC’s.