Optonica Voice Matrix Demonstration
7"/33rpm
The googl translation came out kind of funny, it seems to describe a system where a mic mixing box is connected to the RM decoder so you can swap the vocalist with the mic input for karaoke in quad?:
"KI 1144 voice matrix DEMONSTRATION RECORD voice matrix What is a voice matrix? Sharp first released a stereo with a built-in microphone device in 1969. I walked through the play stereo, which can be said to be the product of the current Young. It's called this play stereo. Open has now taken the mic mixing device to the next level. So, what kind of device is this voice trick device? Speaking of one day, it is a completely new device that matrixes the sound of the instrument and reduces only the voice of the singer in the lower part. Mike: Oren A, instead of this little singer, you can feel like you're singing in her pack. In other words, the voice matrix is her hand-to-hand replacement. By the way, when playing the musical record of this voice trick device, only the music of the pack can be used. This is because when a song without a song is played back and the song itself is tuned to the rhythm, it was not possible to sing this song back. .. However, the Voice Matrix was developed with the point that if you sing a song that is actually sung by a singer, you can swing instead of your hand. .. Just one-touch, just judge the voice matrix switch. All you have to do now is control the microphone level appropriately. Of course, if you don't ash the Voice Matrix switch, it will be a duo with a singer as a general microphone mixing device. In addition to mixing this voice matrix circuit, you can create your own original music serve by mixing your favorite Touhou instruments, such as guitars and trumpets. As a singer and as a person ... It will be more fun instead of the traditional passive stereo check that you only think about, instead of the sexual stereo technique that you participate in. This is her Voice Matrix, Mike Trende. This record was created as a dedicated record for the Voice Matrix, but when you're looking forward to it as a regular record, it's recorded as a channel record, so the SIDE 1 of the Quad Selector's Irregular Matrix) Shiretoko Love Song Kazumi Yasui Written by Kazumi Yasui Written by Hira Koji Hayakawa Song"
Here is pictures of a Sharp MX-400 mic mix box: