Android's 10 Millisecond Problem Mobile Audio Latency Test App Android Audio Player USB Audio and MIDI for Android

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echo,delay,beat sync,delay,decayBPM-based Echo for iOS, OSX and Android

Additionally to the traditional decay and dry/wet parameters, the Superpowered Echo features a beat synced twist: the time can be adjusted by bpm-based beats, so you don’t need to manually calculate how many milliseconds to set the delay time.

Most other echo implementations have unnecessarily high CPU usage - but the Superpowered Echo is effectively invisible to the CPU.