What kind of software?

In the 70's none as such, other than custom coded environments running on small mainframe type machines in universities and research labs.

In the 80's still very little, although MIDI came to the fore and so many sequence based platforms were developed to provide control over external hardware synths. Some went further and included score based input and control at what must be conceded to be inflated prices for the functionality provided.

of note at this point are pro-24 and its predecessors pro-16 and pro-12 on the Commodore 64 and later the Atari ST512/ST1024/Mega2St/Mega4ST (those numbers refer to the number of kB of RAM or the number of MB). Also Composer and Performer for the Mac (original series macs and the later SE series - small RAM footprint (less than 1MB))
 
Actually not - mostly with real instruments and the odd keyboard synth. We recorded to tape in up to 48 tracks (by synching two 24 track machines together using a central clock for timing pulses to the motors) and we had to be far more creative in our use of FX units than we need to be today - by which I mean that, unlike a modern daw, we did not have an infinite number of instances of a hardware FX unit and so had to plan exactly how we would use what we did have as we proceeded with a mix.
 
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