I realize the proper way of doing this would be to get an audio It never converted a signal to line level. The cable, was just a "breakout" that separated the headphone (out) from the microphone (in) connectors. The thread you referenced is about the TRRS jack or Tip, Ring, Ring, Sleeve and these are typically used in telco, not pro audio (yes, you can get very good quality sound from them, but they’re never found in even the smallest recording studio).
Macs aren’t recording/pre-amp devices and do not contain the necessary components to raise the voltage to line level. Microphone voltage is extremely tiny (millivolts) where line level input is about 1 1/4 volts. The key differentiation between mic and line signals is the voltage. Your 2009 MacBook had only a microphone input and not a line input. The audio jacks on all Macs are microphone inputs and not line inputs.
This was possible with my very old 2009 white MacBook.
Press PLAY on your IC recorder to start the playback of the messages to be recorded on your computer.I would like to plug in a 3.5 mm cable to the output jack of the electronic drumset and connect the other end to my computer to record the drumset's sound. On the Audio Recording window, Tap on the record button. Press PLAY on the IC recorder to start the playback of the messages to be recorded on the computer. If the volume mixer is set to MUTE, you will not be able to record anything. Verify the sound level in the volume mixer by clicking on the volume icon from your taskbar. Click the Microphone mark on the Voice Recorder ( Sound Recorder) application. Open your Windows 10 Voice Recorder ( Sound Recorder) application. On your computer, open an Application or Software which supports sound recording, and record from the IC recorder to the computer. NOTE: If your computer does not have a Microphone jack or In-Line jack, you can use the USB Digital Audio adapter. 
Plug the other end of the mini plug cable into the Microphone jack or In-Line jack on the computer. Using a mini plug cable (not supplied), plug one end of the cable to the Headphone jack on the IC recorder. IMPORTANT: If any model-specific information is needed to complete any of these steps, refer to the operating instructions supplied with the product.
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