Mellotronists

I haven't heard those Birotron samples on M-Tron but always thought the instrument was 
hard to hear on record (see Wakeman's CRIMINAL RECORD & Yes' TORMATO) very bass-ey 
and distant sounding. I heard that Biro used 2 Mellotrons to make the 8 track tapes, so 
you'd think that this potentially might've sounded good.
 I assume one could create their own Birotron sounds by looping Mellotron samples then 
lowering the fidelity (LP filter)