Vintage Synth Explorer Forums

I'm working on a composer's archive that dates from the early 70s. Synth sounds on his tapes seem to be Arp and photos confirm it to be the Arp 2500 model. There is an "exam" in the archive files, that he gave at the New School, asking his students how to patch certain sonorities. Could you get two notes simultaneously on a 2500 using patch cords? I thought it was one note at a time? I asked some Moog guys who said you had to have more than one synth to get more than one sound at a time. Other people can't remember back that far. Thanks for any info/suggestions.
--Georgina, NYC

Afaik you could play up to 3-notes at a time on an Arp 2500 assuming there were enough complete voices in the synth itself.

The model 3001 (?) 5-octave keyboard was monophonic on the bottom two octaves (reverse colored to show the key split) and duophonic on the upper three octaves.

that explains the black keys at the bottom end. first time i've seen that explained. so it wasn't so monophonic after all. thank you !!!