Thanks William & Paolo.
The instruments used were nearly all of them! But to be precise;
Piccolo, Flute 1, Flute 2, Alto Flute, Oboe 1, Oboe 2, English Horn 1, Hecklephone, Clarinet Eb, Clarinet Full, Clarinet, Bass Clarinet, Bassoon, Bassoon 2, Contra Bassoon.
Horn Triple, Horn Stopped, Trumpet C, Trumpet C muted, Tenor Trombone, Bass Trombone, Tenor Trombone mute A, Tuba, Contrabass Tuba, Tuba muted.
Vienna Choir (fortunately the chorus is wordless throughout)
Solo Violin, Orchestral Violins, Orchestral Violas, Orchestral Celli, Orchestral Bassi, Chamber violins, Chamber Violas, Chamber Celli, Chamber Bassi, Harp 1
Bosendorfer Imperial, KH Organ, Celesta, Glockenspiel, Xylophone, Marimba, Gongs
Timpani A, Bass Drum, Snare Drums a4, Field Drum A, Castanets, Tambourines A-D, Triangles A-D, Cymbal A, Cymbal D, Tam - Series A+B.
The total loaded in RAM is 30GBs. I have 145 channels across 22 VEs. I use the Vienna Konzerthaus GrosserSal Stage with two microphones.
I'm lucky to have a monster PC which copes easily. Even at full pelt CPU usage doesn't get above 60% and CPU temperature just over 50 degrees.
Sorabji wrote a few other orchestral works and 11 piano concertos. The only orchestral piece performed live is his 5th Piano concerto which is for failry normal forces and is available on CD. It's a much earlier work than the 'Jami' Symphony and less approachable (he mellowed with age).
There is one even bigger work his 'Messa Alta Sinfonica' possible 30 minutes longer, similar orchestral and choral forces but also 8 vocal soloists.