Sets the current text style to USER1.
This style usually maps to the AutoCAD compiled shape (SHX) font file Txt.shx. Text you add using the MTEXT and DTEXT commands default to this style thereafter. If you use the AMTEXT3, AMTEXT5 or AMTEXT7 command before using the MTEXT command, the text style resets to STANDARD and the effect of the AMSTYLETXT command is discarded.