Same sample for multiple instruments?

[XD005]

Hello. I'm new to OpenMPT. I make my songs in midi and then bring them over to MPT for use in my games because I love those GBA-Style sounds in my games. I have two questions.

1) How do I use the same sample for multiple instruments? Like if I want two things to use my guitar sample, it sorta wastes space to load it twice in the sample tab.

2) Where can I find more GBA-Style samples. Things that sound like this:
http://www.youtube.com/watch?v=gSUswFiel9Q&feature=related
or...
http://www.youtube.com/watch?v=8WdANZGyngM

[Saga Musix]

1) How do I use the same sample for multiple instruments? Like if I want two things to use my guitar sample, it sorta wastes space to load it twice in the sample tab.

Have a look at the sample map on the right side of the instrument tab. There's a note mapping and a sample mapping. You can change one of the sample numbers, and then right-click and choose "Map all notes to sample x"... However this does only work in IT/MPTM format, in XM format you will always come up with duplicate samples in the file.

2) Where can I find more GBA-Style samples. Things that sound like this:

Uhm, those are pretty generic low-quality samples. You can find samples of this quality in almost any MOD file. Or try extracting them from GBA music (don't ask me how to do that but your favourite GBA emulator does probably know)