Используйте приложение APKPure
Историческую версию Signal Gen можно получить на Android
Генерация синусоидальных, прямоугольных, линейных звуковых сигналов с разными частотами
It is used to generate sine wave, square wave, ramp wave audio signal of different frequencies, the frequency and gain can be adjusted, and some commonly used frequencies can be stored. It is convenient for the product to test indicators of different signals. It can also be used to demonstrate the effect of different frequency gains of the sound and observe the shape of the waveform.