I don't have any clue why someone who is often mentioned as having negative desire to sing would suddenly need a high quality audio mixer, who she is willing to blow a lot of money on. I am not being snarky I actually don't fucking know
She's always been into singing. She was one of the most excited members when they got Disney perms and jumped on the chance to do a Disney-only karaoke, it's just that she was never confident in her voice so she always said she would never release an orisong. She's been showing up in a lot more songs though, Ike's karaoke and Pomu's birthday cover for example, so I guess she's at a point where she's comfortable with her voice. As for why she's 'suddenly' looking for an audio mixer is because of the entire thing with Tachibana. She's worked with Tachibana before with her lofi mixes and I wouldn't be surprised if she contacted him about her orisong, but then all that shit happened so she had to find someone else.