Epson DFX-5000 User Manual page 109

Consider these things when you use the Master Select command:
Master Select cancels any of the listed features that you do not
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set. For example, if you have already set 12 cpi, and you try to
use Master Select to set emphasized double-strike only, the
character width is reset to 10 cpi.
Proportional overrides 10 cpi, 12 cpi, and condensed.
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Double-strike is ignored when combined with NLQ mode.
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Only underlining can be combined with high-speed draft
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without slowing the print speed. If other combinations are
used, high-speed draft is temporarily overridden and draft
mode is selected.
Print quality and font are not part of Master Select and must be set
separately using the ESC x and ESC k commands.
Getting the Most from Your Printer 4-13