BOSS DD-3 Clipping/lo-fi mod and self oscillating momentary switch!

[Tome]

Hey Everyone.. I'm aware there are tons of DD3 post and I've read all of them!  Cant find two specific bits of info that I'm after.

The first, is info regarding the lo-fi/clipping mod which involves diodes and a 3 point switch connected to the feedback lugs. Would love to know what type and value of diodes people are and have used in this mod. A brief description of how to wire it up would be useful too. This will be installed along side the hi-cut mod across the feedback lugs.

Second: would love to know how to achieve this! >     https://www.youtube.com/watch?v=9NQFI_zCI2c&t=39s
If anyone knows how to instal a self oscillating momentary switch i would love to know!!

Thanks in advance,
Tom