MOTM

hello everybody!

i'm having trouble understanding the difference between ac and dc 
waveforms; and also between ac or dc coupled waveforms, and how this 
affects functioning of certain modules (particularly the '110 
vca/ringmod).

i've been reading a lot of manuals - arp 2600, emu, serge gold book - 
but alas, i've managed to get more confused ;o)
so, i was hoping some of you wizzards could help me out with this.

(i'm also confused about "waveforms with a dc offset/component")

i do understand that ac is alternating current, though ;o)

is there some relationship between 
ac = audio freq voltage 
dc = control voltage?

though some audio freq are not 'alternating'?

thanks!
greetings,
chef!