Fingered Tremolos

Hello
The fingered tremolos only seem to work with the intervals of minor and major 2nd. Doesn't work with 3rds and 4ths.
Anyone else having the same problem?
Thanks
Brian
The fingered tremolos only seem to work with the intervals of minor and major 2nd. Doesn't work with 3rds and 4ths.
Anyone else having the same problem?
Thanks
Brian