MAM, PAMM, and LAMM are different money-management systems.
MAM (Multi-Account Manager) accounts allow the manager to assign a higher leverage to specific subaccounts.
Under PAMM (Percent Allocation Management Module), the investors’ portfolio is affected by the size of their deposits. Typically, the PAMM manager is also trading with his/her own funds.
Under LAMM (Lot Allocation Management Module), whenever the manager buys one standard lot of an asset, every customer’s account would automatically increase by one standard lot. Unlike PAMM, the system does not consider the size of each investor's deposit.
More Infomation
https://oxsecurities.com/partnerships/introducing-brokers/
https://oxsecurities.com/partnerships/money-managers/
https://oxsecurities.com/partnerships/white-label/
https://oxsecurities.com/partnerships/regional-partnerships/