Voltas

I want to use the first volta to return to the beginning 4 times then play the 2nd Volta. I thought that all this required was setting the measure count to 4 in the first Volta but no joy. After going back to the first repeat sign, another play through occurs but instead of playing the 1st Volta again, it jumps to the LAST MEASURE of the 2nd Volta. I assume I am doing something wrong - but I don't know what.

BTW - Sometimes my playbacks are very scratchy - other times fine???

Thanks for your help