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Camcorder XLR Adapters - B&H Explora
https://www.bhphotovideo.com/explora/pro-audio/buying-guide/camcorder-xlr-adapters#:~:text=A%20line-level%20audio%20signal%20is%20a%20much%20stronger,the%20camera%20will%20be%20a%20loud%2C%20distorted%20mess.
Camcorder with Line Input | AVForums
https://www.avforums.com/threads/camcorder-with-line-input.1807685/
You could always try a resistive 'pad' to reduce the line level output from your keyboard to mic level, to match the mic level input required for an external mic input on a consumer camcorder. You would need to ensure that you can remove any AGC (Automatic Gain Control), which is normally the standard option for external mic inputs.
Amazon.com: camcorder with audio input
https://www.amazon.com/camcorder-audio-input/s?k=camcorder+with+audio+input
Line Level to Camcorder - The Gear Page
https://www.thegearpage.net/board/index.php?threads/line-level-to-camcorder.1479136/
RCA inputs are considered "consumer" line level (-10db). If you feed them with a "Pro" level (+4 db) you will get distortion (which you have experienced). Doesn't the Yamaha mixer have any subgroups? If so, they usually have faders so you can control the output level of the subgroups independent of the main mix.
Camcorder XLR Adapters - B&H Explora
https://www.bhphotovideo.com/explora/pro-audio/buying-guide/camcorder-xlr-adapters
Camcorder XLR Adapters are compatible with any kind of camera that features a mini-plug (1/8” or 3.5mm) stereo microphone input. Camcorder XLR Adapters feature a tripod thread at their base to mount onto a tripod. Some mics require electricity, called “phantom power,” in order to operate. Some Camcorder XLR Adapters can supply condenser mics with phantom power. …
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