Cory, similar to many function generators of the era,
Search the heathkit, Exact, Wavetek in 1970-1990
This one seems like a copy of one of those.
The pulse TTL, TTL logic levels, low sinks a few mA, high 3V CMOS 0, 5V
Check a wiki for logic families
Sweep
lin- freq increasing at fixed hZ per unit time, Log, logarithmic increasing freq with time.
Similar to spectrum or network analyzer sweep
Counter is off in some control settings.
Just play around
Jon
Froggie the Gremlin