Formerly known as anonuserguy
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All my custom remixes are achieved through editing preexisting footage, mostly.
I use Vegas Pro 15 for the video, and rhre3 for the audio.
github.com/chrislo27/RhythmHeavenRemixEditor
I usually get footage from AngryTapper, MF5K, or just record it myself.
Not that it plays a role in my custom remixes usually, but I use FL Studio for music composition and Paint Tool Sai for drawing if you're curious :)