Violin.
What I’d like is: top note a minim (half-note) with a tremolo (the tremolo is fine); on the same stem, and lower in pitch, two further notes, notated as crotchets (quarter notes), everything stem up. I hoped I might manage it using two up-stem voices and extending the stem on the lower voice, but the lower voice promptly moves to one side once it clashes with the minim.
Any ideas on how I achieve this? I can’t find this in the manual but it’s hard to know where to look.