Noon is like 10% of the input, so ~1V with 10V in, and as I said the signal will be less than that probably closer to 300mV RMS on average.
At 3 o’clock volume your still at probably 25% of the input voltage.
As I pointed out in more detail in another thread Volume pots are not linear. Volume Pots are not Linear
The input sensitivity is a function of the amplifiers gain, any overhead the circuit needs and the power supply rail.
It’s mostly moot anyway, 7v sounds like a lot more than 2.2V, but it’s only about 7dB’s.
It looks like the input sensitivity of the Orr is 4V RMS, that’s pretty high, would require an ~11V PK2PK input signal to clip.