[sdiy] cs30 trigger input

[gregory zifcak]

hi,

i am in the process of trying to trigger a yamaha cs30 sequencer from the 
external input. it looks like the sequencer needs +15v pulses to step, and 
the external input is converted to a trigger that my cheap meter is reading 
as negative-going from +10v to +4v. this seems weird to me. i had heard that 
the yamaha triggers were 0 to -15 or some such thing. anyone know what i 
should be getting? supposing my reading is correct, how would i go about 
converting this to +15? i've converted s-trig to v-trig, it must be similar. 
any ideas?

thanks in advance,
greg