The MOSTRO is a nice little poly FM synthesizer by Outer Space Sounds. link.. Here’s the definition file I use with Pyramid.
NAME:MOSTRO
OUT:A
CHANNEL:1
7:VOL
74:INDEX
3:RATIO
9:FEEDBACK
14:SUB
15:ENV_RUTE
16:ENV_AMT
17:ENV_AMP
73:ATTACK
13:SUSTAIN
72:RELEASE
77:LFO_AMT
76:LFO_FREQ
78:LFO_RUTE
91:DLY_AMT
16:DLY_FDBK
5:GLIDE
1:MODUL