I think Capitol did as well, at east for their early stereo era Broadway cast recordings, at least until 1964.
On Aug 30, 2014, at 12:19 PM, Tom Fine <[log in to unmask]> wrote:
> RCA for years used a separate mono setup and engineer. I think the same was true at Columbia. I don't know what 2-mic folks like Vanguard did for mono releases. You definitely can't successfully sum 2-omni stereo to mono. I think the Europeans who used MS or other crossed-matrix methods were able to use one channel for mono (although there were crosstalk phase-cancellation issues with that method).
> -- Tom Fine