Check the MIDI Implementation Guide for a more verbose description of the parameters: Ventris Dual Reverb: User Manual and Documentation
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NAME:Ventris
OUT:A
CHANNEL:1
1:AEngine
2:ATime
3:AMix
4:APreDly
5:ATreble
6:AOutput
7:ABass
8:ADiffu
9:AModDep
10:AModRate
11:APrDlyFb
12:APrDlyMd
13:ASize
14:AInLowCt
15:AEngPrm1
16:AEngPrm2
17:AEngPrm3
18:AEngPrm4
19:AEngPrm5
20:ASpcCtrl
25:BEngine
26:BTime
27:BMix
28:BPreDly
29:BTreble
30:BOutput
31:BBass
32:BDiffu
33:BModDep
34:BModRate
35:BPrDlyFb
36:BPrDlyMd
37:BSize
38:BInLowCt
39:BEngPrm1
40:BEngPrm2
41:BEngPrm3
42:BEngPrm4
43:BEngPrm5
44:BSpcCtrl
50:DualSngl
53:IORout
54:RvbSend
55:ABxFade
80:DecPre
82:IncPre
90:TapTempo
97:TapHold
100:Exprssn
101:Bypass
102:TgglByPs
103:RcllByPs
104:RcllEnga