Sometimes when I'm placing notes down in the piano roll (blue notes) I will adjust the note so that it is say half a bar long but the sound will only last for half of the note. So for the first half of the note the sound plays and then the second half is silence. I've tried everything and don't know what to do. Help would be much appreciated, thanks.
Welcome to LMMS.
What instrument is it?
Some instruments don't sustain a long note duration, you may want to try another instrument in it's place.