A probe for an oscilloscope generally has 1,000,000 Ohms resistance. It’s done so that very very little current flows through the circuit of the scope, to avoid altering the operation of what you’re monitoring, and to allow directly monitoring much higher current circuits that would otherwise be possible.
If you understood what I Just said, then you would know this basically means you can tap the audio path directly, and that "splitting" it wouldn’t actually be any different than tapping it, other than adding another possible point of failure. 8)
That being said, it’s important to check the limits for any scope’s capabilities, so you don’t go frying it hooking it up to stuff you shouldn’t. Like the RF outputs of a transmitter. 😉