The Multi-MA system works as follows (let's take an example).

If the volume of 0.01 lots is opened on the Master account, then the volume of the transaction will be 0.02 lots on the account with the coefficient "2", provided that the amount of equity on these accounts is equal. That is, if the total profitability on the Master account of the manager is 10%, the total profitability on the Multi-MA account with the coefficient "2" will be 20%. In other words, the multiplier increases the volume of the transaction.