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  I have heard of speech `de-helium-ifiers', i.e. processors which lower the
frequency to reverse the helium effect. Are they used much in practice? Are
they made or supplied now?
  Another sort of distortion of speech that sometimes occurs is "gasmaskyness"
caused by talking (while diving or on land) into a small fullface or
mouth-and-nose mask (gasmask, Kirby Morgan mask, etc). I once heard of a
speech processor to `de-Kirby-Morgan-ify' speech: does such a device exist?
Are they used much? Where to get one? What distortion in terms of frequencies
and differential amplification does `gasmaskyness' of speech consist of?
  I have heard of aqualung divers trying to communicate underwater by talking
into their mouthpieces and the listener has to decipher the result with its
resulting phonetic distortions (loss of labials and rounded vowels, distortion
of dentals). It would be much easier with a fullface mask - which should be as
small as possible so he can clear it easily if it floods - which small size
makes the speech `gasmasky', see previous paragraph.

  P.S. for diving PC Windows fans: here is a BOO'ed form of a Windows icon
(32*32 pixels, color) of a diver with a short-duration rebreather on (UK Siebe
Gorman Salvus), if it is any use to anyone:-
  ..... snip snip snip snip snip .....
DIVSALV.ICO
~20@01*~3j08001H0~2:0000200~2@00000401000~40P00~FP000P00008200800~2
P0200820~2P8200<30`0000?l00?l0~2ool0o`000?l0o`3oo`00oooo~:L000~<1`00~=L000
~<1`004000~:L00A4@00*~81gM`1g4A4000~60`00014G4A40~7<300=g4ALA68P000~30`031
SMg
4ALHR800~40`00<c1gLAMhR800~40`001P07]aR7R000~40`00H6I[MhR8L000~40`061S<c\8
R8
~70`1VH`002hR0~70fH6<000Mk00~61V<0H30007L0~7H0<6H300~91P1cH70`~91V1gL`1
gP000
~7H0MgN01gMg00~8MgMVH7MgM`00~6MgMfIVIgMgM`~7MgMVIVIWMgM`~7MgIVIVIVMgMg~7MgIV
IVIVIgMg~7MgIPaPaVIgMg~7MgIP1P1VIgMg~23<c0~2MdAVIVITAgMg00c<c<c037M4A4A
4A4Mg
M`3<c<c<c<`7A4A4A4A7M`003<c<c<0<04A4A4A4MgL0~23<c0~31
4A4A4M`~9o`O08?`7^0S`
3g@2h*@000Kh040=L~21^0000J0~21P000@H00044~20`0000<0~21`0000L0~2
1`0000l0~27`0003l0~2?`000?l0007o~20ol001oo~2?ol003hO~2>0H00300P03h1\00oQoP
1ooo~2
  ..... snip snip snip snip snip .....

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