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6n136
i've now used a 6n136 with 4k7 in place of 1k2 (leaving out 5k6). strange thing was the 6n138 wasnt working with my usb>midi cable but the 6n136 is fine.
all my other midi gear is in storage so that's the only test i'm able to do right now.
i have socketed the resistors, so i can test more soon.