I find this very hard, especially if the song requires you hit them one after another very quickly. This can get very frustrating fretting like this with one finger, and instead of repeatedly alternating strings with the same finger I can either lay one finger across both strings, or use an adjacent finger to fret the different string. But in the former case, I can hardly ever get the notes to sound equally-well fretted (know what I mean by that?) and it is hard to mute one of the two strings when needed. The latter method is also difficult because it feels unnatural and doesn't seem to be a reliable technique. Got some advice for me to make this easier? Thanks!