Sir Elventide, with your permission, comrade commissar, I would like to either have the ability to have my violin also be a guitar, or retcon it so it is a guitar.
Having a hard time finding good violin covers of songs. VSQ is good, but they're a quartet, and that's what I want the whole violin thing to evolve into, but not start out as.
Talk shit, get hit!
Hahaha, just kidding. Considering that your violin is part of your Psyche, it can be what you want it to be, whether that entailed a violin/guitar combined instrument or a violin that you'd just retconned into a guitar or some other possibility, provided that it makes sense.
If I'm correct, based on your Psyche's description, you're basically giving your teammates buffs depending on the themes that whatever song you're playing brings to mind, with the quality determining the strength of the effect. In the interest of translating that to gameplay mechanics without making you too overpowered, I was thinking about first rolling a d6 to determine the quality of your song. Rolling between a two and a five will allow you to boost a baseline of two Attributes relating to the theme of the song, with the quality roll value being split neatly between them. For example, a quality roll of five will be split between 3 for one Attribute and two for the other, each value being assigned randomly. Rolling a one; however, will force you to only boost one Attribute by +1. Of course, rolling a six would allow you to affect a third Attribute relating to your song's theme, its value determined by rolling a d6.
Of course, as your Psyche are used to influence others, Charisma would be the Attribute that its power will be based on. In fact, perhaps for every five Charisma you have, you can further boost the Attribute of your choosing by one after the quality di(c)e had already be rolled since your character are pretty much a bard.
Obviously, the stipulations of this Psyche would be that you have to continue playing the song each round for it to continue working and that any attacks on your person that knocks you down, stun you, or do whatever, will interrupt you and stop your song and its effects. So, do you think my suggestion is fair or do you have something else in mind?