Doing some trial-and-error, here's what I think I've figured out so far. Right or wrong?
What the buttons do:
SKIP – This is not a lockout. It is basically like a scan button on a traditional scanner where you tell OP25 to get off the current TG and search on to the next one.
HOLD – This holds on whatever the current TG is that you’re on.
GOTO – This gives you a pop-up box that lets you type a TGID that you wanna listen to. Then it will hold on that TG.
B/LIST – Blacklist, this is a temporary lockout. The TG will no longer be stopped on during your current session. After you close OP25 and re-start it again, any TGs you blacklisted (temporarily locked out) are restored and will be stopped on. You must click the B/LIST during an actual voice call, not during the scan/search hold time. Otherwise, you’ll get a pop-up box asking what TGID to blacklist.
W/LIST – Whitelist, always gives you a pop-up box to enter the TGID. If you whitelist even just 1 TG, OP25 will only stop for that one TG. All other TGs will be ignored. This is temporary until the next time you run OP25, after which the TGs are no longer whitelisted and OP25 will stop on whatever it finds.