A pair of those sure made my SD1 sound really great.
Fulltone even serve your voice well,and they sound warm
and soft, not cold and too sharp as many others.
http://www.stkpro.com/pro-spm-152ap.htm

Happy Playing
GJ
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Cheers 🥂
GJ
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"Success is not counted by how high you have climbed
but by how many you brought with you." (Wil Rose)