Here are three ways to get what you want. The 1st does exactly what you ask for, the second the same but altering the default note length, and the third getting the same effect without the double-dotted note. All three display correctly with abcm2ps.

As regards posting the music here, that's not really possible, the best you could do would be to link to a web page with the score on it.

Mick

---

X:1
T:Test
M:4/4
L:1/8
K:A
A> G A2 {AG}G2>> B,||

X:2
T:Test
M:4/4
L:1/4
K:A
A3/4 G/4 A {AG}G>> B,||

X:3
T:Test
M:4/4
L:1/8
K:A
A> G A2 {AG}G2-G> B,||