I have purchased the MIDI interface cable already albeit a cheaper version, hopefully it works well. But as for the audio cable goes, I have already tried plugging in an AUX cord cable with the proper adapter and have not been able to receive an audio signal. The Mac OS is very limiting in this regard. So I am assuming I need it to recognize a USB-C connection, as others have been able to connect external mics this way. Again, I'm just trying to get around the limitations Mac OS has. Thanks.If you want the keyboard to transmit or receive MIDI, you'll need to get a USB-MIDI interface cable. You should beware of buying an inexpensive one online, as they're often unreliable or unsuitable for one reason or other. Instead, you'd be advised to get something like an iConnectivity mioXC:
mioXC — iConnectivity
www.iconnectivity.com
That isn't your only option, but some users have reported that the iConnectivity mio works well with older MIDI keyboards-- including older Yamaha models-- and the mioXC has a USB-C connector so you won't need to buy a separate adapter for it.
That will let you transmit MIDI from the keyboard to Ableton Live to be recorded or to play virtual instruments, as well as receive MIDI from Ableton Live to be played on the keyboard using its sounds.
If you want to record the keyboard's audio, you'll need a TRS stereo audio cable. If the PSS-480 has a jack for a larger plug (1/4"), you'll either need to buy a separate audio adapter for one end of the cable, or you can buy a cable such as the following:
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3.5 mm TRS to 1/4 in TRS - Stereo Interconnect | Hosa Cables
Find Hosa Stereo Interconnects near you. We supply stereo interconnects that are durable with enhanced signal clarity perfect for professional and consumer use.hosatech.com
Again, the linked cable isn't the only choice available, but I've had experience with various types of cables from Hosa Technology and have been happy with their quality and reliability.
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