This plugin was originally found by Hikaru421/Hika421 on the previous forum
UTAU全ウィンドウ同時再生プラグイン
There are separate plugins for stopping and starting the multiple play.
The download link for the plugins https://www.box.com/s/68sehsh5cep6dzkzvfp8
The files to download are 全ウィンドウ同時停止(to stop multiple play) and 全ウィンドウ同時再生(to start) as shown in the video.
From observation it seems that the plugins use the cached files of the last play so make sure your cache saving options are turned on. If they aren't, go to Tools>Option>Cache Config tab (the middle one) and tick the box to cache intermediate files. Choose however you want the cache saving to work from the options below and click ok.
UTAU全ウィンドウ同時再生プラグイン
There are separate plugins for stopping and starting the multiple play.
The download link for the plugins https://www.box.com/s/68sehsh5cep6dzkzvfp8
The files to download are 全ウィンドウ同時停止(to stop multiple play) and 全ウィンドウ同時再生(to start) as shown in the video.
From observation it seems that the plugins use the cached files of the last play so make sure your cache saving options are turned on. If they aren't, go to Tools>Option>Cache Config tab (the middle one) and tick the box to cache intermediate files. Choose however you want the cache saving to work from the options below and click ok.