canawave mix/arrangement overhaul + shared-voice synthesis fixes

Arrangement:

• lead is now THE Edge guitar: a 16th-note arpeggio tracing a melodic motif (octave-lower, octave-doubled), through chorus + 1/4-triplet delay + an evolving phaser/flanger (continuous across the arp via absolute…

• proper diatonic walking bassline all through (was one-note-per-bar), pulled far down in the mix

• bridge is an exposed GRAND BRASS SWELL that builds: drums/narration drop out, bass drone + swelling pads + crescendo brass climb ~15 dB and peak above the choruses, then a Peart tom fill crashes the band back…

• simplified FX + per-voice level rebalance for a cleaner mix

▶ Play it: Loon Referendum — parked on the genre this change names https://stellate.app/?genre=canawave&seed=2525&path=1505.3698,1524.3731,1486.3731&xdur=13.122

fd76603 https://github.com/aboard-io/stellate/commit/fd766035537b2999e22d7c3249ef1d0cdd7058eb