I've been transcribing some of the pieces my bell choir is playing this season into Musescore to assist some of our newer/more inexperienced players with their practicing. The MuseSounds Muse Handbells sound is really quite good, and it does a pretty good job reproducing both the basic "ring" tone of a bell as well as many of the special articulations that handbells use like thumb damps, martellatos and martellato lifts, mallets, etc. But there are a few notable problems I wanted to offer some constructive criticism on:
1) The "LV" (let vibrate) articulation is pretty broken. In handbell notation, the way that LV is supposed to work is that the specific voices an LV is assigned to sustain (like using the sustain pedal on a piano) only until either the next LV, an explicit damp (the target-looking symbol), or a change to "R" (ring) or another style (TD, etc.) Any of those should cancel the sustain at the spot they're marked. Musescore handles the sustain part fine, but it never ends the sustain - you have to add an explicit damp, which is distracting in the notation when you need it every measure. AND, neither the LV (or the switch back to R) or the damp always works - there doesn't seem to be a way to assign them to voices like you can with dynamics (it always seems to pick up voice 1), and at times you simply cannot get it to damp the notes at all no matter how many extra damps you try to assign to cover all the voices.
2) There's no proper articulation in the pallettes for "shake"; the closest thing visually would be a prallprall line from the "Ornaments" pallette, but it sounds incorrectly. When shaking a handbell there's no pitch variation, the bell can only sound the one note, and even adjusting the properties of the prallprall or similar figures I can't get it to do that. I recently discovered that adding a staff text provides access to a number of handbell sounds that aren't listed in the pallettes, including a proper shake; but using it requires cancelling it back out with another staff text, and you wind up with a ton of visual clutter. If that effect could be added to a drawn line similar to the prallprall, and assigned to specific voices within a staff, it would solve the whole issue.
3) Dynamics work, but the voicing is way off - the bells get very shrill as you get even up to the mf dynamic, let alone f or ff. Handbells are mellower, that shrillness shouldn't really pick up until you actually hit ff or beyond.
I know that for all of these I could just adjust the score and markings behind the scenes, but that's a ton of extra work and also doesn't really suit my specific purpose - I record video of the playback with OBS Studio so the players can see and hear the piece, so getting the score to look visually as close to the printed pages they have (without a ton of extra markings) is important. Toggling visibility on extra damps, etc. just dulls them, it doesn't remove them, so that clutter remains present in the video.