The suggested way of making basic triads such as C-E-G on English concertina seems to be to use one finger for 2 buttons (in this case for the C and G). I'm finding it really difficult to do that on my Jackie concertina (using 3 fingers equally or more difficult). I haven't had access to other concertinas so I'm wondering if the problem is me or something to do with the buttons on the Jackie. Any help welcome