I have a MONO-POLY and POLY 61, I use them only in the studio . The POLY 61 can travel ok but the MONO-POLY stays put. The MONO-POLY is like a japanese minimoog but with LIMITED polyphonic possibilities and with 4 oscillators it has to be warmed up. But the oldest KORG synth I have is a UNIVOX K-3 which was released in 1973 and later released in 1975 as the 800-DV. It also does'nt like road travel.