For those interested, I've tested what happens when material recorded in one
mode is played back in another after the TOC is played with.  Non-LP units do
not check the SP/LP bit and mistake LP2 for SP stereo and LP4 for SP mono:


mode upon      mode bits           result on              result on
recording      in TOC              MDLP unit              non-LP unit

SP stereo      SP stereo           SP stereo              SP stereo
SP stereo      SP mono             half-speed SP mono     half-speed SP mono
SP stereo      LP2                 silent                 SP stereo
SP stereo      LP4                 silent                 half-speed SP mono

SP mono        SP stereo           double-speed SP mono   double-speed SP mono
SP mono        SP mono             SP mono                SP mono
SP mono        LP2                 silent                 double-speed SP mono
SP mono        LP4                 silent                 SP mono

LP2            SP stereo           silent                 silent
LP2            SP mono             silent                 silent
LP2            LP2                 LP2                    silent
LP2            LP4                 nonstop squeal         silent

LP4            SP stereo           silent                 silent
LP4            SP mono             silent                 silent
LP4            LP2                 double-speed LP4       silent
LP4            LP4                 LP4                    silent


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