I've included several links to get multiplayer working, help remedy the sound loop bug, unlock everything, and some good old fashioned cheat codes.

Probably the best Rainbow 6 game. Was a ton of fun for years when playing with friends. The cover system works well and every weapon has a unique feel. Unfortunately the sound loop bug has made it very difficult to enjoy online. If anyone has any other fixes for the sound loop bug, or easier ways of getting multiplayer running, let me know. Also, if anyone has a link for the Comcast Event map, please message me.

Here's a savefile to unlock everything in the game (Still works as of 2022):
http://www.cheatsguru.com/pc/tom_clancys_rainbow_six_vegas_2/files/

A guide to get multiplayer functioning via Gameranger;
https://steamcommunity.com/app/15120/discussions/0/3118172724634267129/

Here's a list of settings to help the sound loop bug happen less frequently (Turning off Vsync might not be the best option for some players) : https://steamcommunity.com/app/15120/discussions/0/616189106755568359/

This reshader fixes the sound loop bug for some players, somehow. Validate files after install to avoid some... interesting bugs.
https://www.nexusmods.com/rainbowsixvegas2/mods/8?tab=posts

If any of these files go down, let me know, and I'll gladly replace these links with my own files on MEGA or something.

Some cheats, you will have to enable the "Use Xbox 360 Controller for Windows" option in the controls menu, and do these inputs at the pause menu during gameplay;

Super Ragdoll Mode:
Press A(x2), B(x2), X(x2), Y(x2), A, B, X, Y.

Unlock GI John Doe Mode (Blue tracers, Red enemies):
Press the Left thumbstick(x2), A, Right thumbstick(x2), B, Left thumbstick(x2), X, Right thumbstick(2), Y

Third Person (Story mode only):
X, B, X, B, Left Analog Stick (x2), Y, A, Y, A, Right Analog Stick (x2)