Audio analysis - sound recognition

Here's a proofread and slightly improved version of your text: I'm seeking a tech-savvy freelancer to assist me in solving a productivity challenge. I need to simultaneously test five mobile phones to ensure that their 3.5 mm audio jacks are in working order. CURRENT METHOD: Currently, for each test, I must initiate a "test call", record my voice, and verify that my voice playback confirms the proper functioning of the audio. WHAT I'VE ALREADY ACHEIVED: I attempted to streamline this process by using a splitter and sending a pre-recorded 300 Hz tone from an external audio source ([login to view URL]). This eliminated the need to record my voice every time. THE ISSUE: However, I still need to listen to the test call prompt until it plays the 300 Hz tone to ensure that the audio is functioning as intended. WHAT I AIM TO ACHIEVE: My goal is to employ software that can automatically identify whether the 300 Hz tone is playing back or not. I envision a setup where I connect all five mobile phones via their 3.5mm jacks to USB adapters, leading to a 5-Port USB 3.0 Data Hub, which connects to a computer. This computer would run specialized audio analysis software, providing a simple "YES" or "NO" response for each phone (based on the port) to indicate if the 300 Hz tone is detected. If you believe this idea is feasible or have any insights on how to achieve it, please send me a message.