XLR-DI Out The XLR-DI out allows you to connect your amplifier to a PA system or recording interface, without the need for mic-ing. A ground lift switch allows you to reduce or remove any unwanted hum due to earth loops. Feedback Elimination Anti-Feedback control can be engaged and adjusted to eliminate the body resonance feedback often associated with amplified acoustic guitars at high volume levels. To eliminate body resonance feedback, switch the filter in and adjust the anti-feedback control until the body resonation reduces. You should find a “sweet spot on” the control where any feedback present disappears. Li-ION The Laney LI-ION battery pack are a self-contained unit that can be recharged within the amplifier, so no need to remove it for charging. The battery life of the Laney Li-ION pack is outstanding, offing up to 24hrs operation. The Laney LI-ION battery pack are a self-contained unit that can be recharged within the amplifier – so no need to remove it for charging. The battery life of the Laney Li-ION pack is outstanding, offing up to 24hrs operation.