I tried sharpie, the ink doesn't seem to really cover the led, i'm not sure how to explain it. I used a thin point permanent marker and the only place i could see black was around it, not over. So i'm guessing it need to be more tar-y in consistence, but also non conductive.
I had not thought of liquid paper or whatever its called. I'd be inclined to try it, but i would probably have to let it dry while offline. And electric tape do block a fair bit, it just never seem to want to cover the led fully, so its still a lightshow over here.
Those S1 are a bit obnoxious. The single red, toned, always on red light on the S5 boards are pretty nice in comparison.
S3's were fine. They have more than 3 leds thats are pretty flashy but the problems one are the Green stroboscopic ones and they have 3 of those each. I have quite a bit.
Its really hard to find people who buy/sell ASIC locally, i got one person in 3 months contact me about my local ads on kijiji. A swap from S1 to S3 would be pretty good atm. I think i would sell my Falcons and my S1's if i had a local buyer.
They are all too old to be worth shipping.
Could get enough cheaply to apply to cover most leds too.