Expected volume is for that specific time frame (ie that hour that 4 minutes etc..)
Expected volume has nothing to do with magnet prices.
A magnet volume bar is a high volume bar (ie top 5% etc..) of volume bars over x days etc..
I doubt you would have many if any high magnet bars that did not exceed volume
Magnet bars are often bars from days or even weeks even months back.
You don't want a lot of them or it wont work you need accurate high volume price action where the market stopped to move.
The intraday concept is not one i have tested as they get broken al the time intraday. Its worth watching but i would not make it a magnet price.
You mixing the two concepts
Magnet bars are high volume bars that the price ahs not retraced back to or at least broken through with high volume
Expected volume is confirmation of more than normal volume for confirmation of direction or expectation of reversal ie in p1 p2 or p3 trades etc..
Just use the magnet price template - and pay attention to the blue actual volume bars on the indicator and make sure its set to 10 min