The M7AG is an auto-gain system designed by Tamura Corporation for use in audio applications. It is designed to automatically help maintain consistent audio signal levels over varying sound sources, such as a microphone, musical instrument, or playback device. The M7AG is an intelligent circuit that ensures signal levels remain consistent for a clear and balanced sound. It uses an integrated signal input detection unit to detect signal level changes, which then automatically adjusts the signal level to the preset level. The M7AG also includes a low-cut filter, which can be used to reduce wind or other low-frequency noises.