Also, got a build for those having trouble:
Yamabiko (green sound skill, triggers corrosion whenever another sound skill triggers)
The footsteps skill (A blue sound skill, corrosion over time, faster with high alert),
Whispers (Another blue sound, NOT starting one, which gives corrosion ticks and speeds recharges and boost own duration on using sound skills),
Sleeping song (purple sound skill, big corrosion tick if the enemy doesn't change stance, plus fast recharge for triggering whispers and yamabiko),
And the green recharge skill
This is an absolutely crazy combo that can beat most enemies, especially on easy modo. Use it if having some trouble, if you need a certain skill for your target of choice (say a stance change for fox), swap that out for the green recharge skill.
Use whispers first, then yamabiko, then other sound skills. hit recharge when trap and footsteps are cooling down. Whispers should be perma-up if you're doing it right.
You should get enough corrosion ball to just bullrush through any skills they send your way, barring no-sells like foxes stance-dependent evade.