Probably the program preset is overriding the rate you're inputting.Right click the file then Advanced options and choose low quality/constant bitrate and then your kbs on the sliding scale back in the main GUI.
I've just done this with one my MP3s encoded at my usual VBR with a min of 256kbs. Converted to constant 32kbs/low quality and the file size has reduced from 4.2mb to 550kb.
Go to your Start button/Programs and click DBpoweramp Converter/Configuration/dmc Configuration.
On the opening dialog box ensure that "Convert To" on Explorer right click is checked - whenever you right click a music file "convert to" will now be a menu item.
Then just do what I said above- making sure MP3[lame]is showing in the "convert to" box at the top in the dialog box which appears when rightclicking a music file and the advanced options button will appear.
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