a quick vamp???

Idon't use the seq much, but just tried "Quick Record" method to generate a 4-bar vamp/loop.
wanted drums from a factory style, then wanted to add: bass, keys, flutes.
for some reason it wouldn't let me do Manual Bass - had to use the full style options. what's up with that?

is there a workaround?
what do you Korg players do when you need to build a quick short sequence (drums sourced from a style; everything else played or overdubbed...)

thanks in advance for any help -- also, does anyone know if the PA900 seq (both for 16 trks and "Backing Sequence" or Quick Reocrd) is the same as the PA3x?

TM