Control Voltages start from DC (0Hz), a tape recoder starts at some 10Hz.
Professional recoders for measurement purpose use FM to record such signals.
So without some sort of transformation it is not possible to record CVs on Tape.
seems to be a datalogger for pc.
these are used to measure and log (electronic) data on a computer. and i guess that the 10bit ADC may not be sufficient for real modular specialists though i think that measuring equipment usualle must be very precise.
you need something that logs data on tape?
Never have given it a try but the following should work without any special tape:
Feed the CV in question into the VC In of a VCA, an audio signal into the audio in. Record the result on any tape. Play it back through an Envelope Follower to extract the envelope (= original CV). This should work with an average modular synth at least. Even though it probably won't do the job to controll the pitch of a VCO.
Proably my outlay was kind of unclear: A tape has an pre-amp (= rec. level) while the audio out of the tape is too low for a synth you're going to raise the output to the level needed by using the Env. Follower. At least any of those I'm familiar with could do this. However, I agree it will be not exact enough for a tonal pitch control. Nevertheless it should work for unpretencious VC for VCFs and VCAs. For atonal music/noise it might be still an intersting way to go anyway.