Check the help file and the reference of [metro], it's all in there and easily understandable.

1. Yes, you can set different speed values, by default in ms, via the right inlet. But not as a list. You have to send a new integer value for each new speed.

2. Yes, the metronome starts and stops with 1 and 0 in the left inlet. This is what toggle switches do.

3. I do not understand the last question. "Stopped ... and meantime use the indicated speed"? Stopped means no data output and which meantime and what is an indicated speed? If you mean the milliseconds you wrote as argument direct into the object, then no, [metro] cannot fall back to this speed. Once you start to feed other values, the initial value is forgotten and you have to control the speed.

Thanks for reply Peter.

I explained wrong the third point. I mean attach a list of different speeds. For example play 300 ms and then 100 ms.

Not as a list. You can send 300 and afterwards 100. You have to develop a mechanism to send the values you need. See the attached patch with examples.

Thank you so much Peter. That was what I needed.