I've checked the CLT results for this guy.
Thanks for your help, now we a have the common name Frank C. Regula confirmed! 

IMDB

Quote:
"Frank Regula" is credited in the following 9 titles (44 profiles)
"Frank C. Regula" is credited in the following 11 titles (59 profiles)

Frank Regula 6 confirmed
Escape to Witch Mountain (1975) as Sound Mixer
Gus (1976) as Sound Mixer
Splash (1984) as Re-recording Mixer
The Apple Dumpling Gang (1975) as Sound Mixer
The Castaway Cowboy (1974) as Sound Mixer
The Shaggy D.A. (1976) as Sound Mixer

Frank C. Regula 7 confirmed
Baby: Secret of the Lost Legend (1985) as Re-recording Mixer
Country (1984)
Pete's Dragon (1977) as Sound Mixer
Something Wicked This Way Comes (1983) as Rerecording Mixer
The Black Cauldron (1985) as Re-recording Mixer
The Black Hole (1979) as Rerecording Mixer
Treasure of Matecumbe (1976) as Sound Mixer

List of not valid (0) credits:


List of not confirmed (0) and found by CLT:


___________________________________________
Definition:
most confirmations
the first two or more are undecided (only if there is no most confirmed)
less confirmations than the most confirmed or the undecided (if available)

Something Wicked This Way Comes - Frank C. Regula - Rerecording Mixer