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To make more of your audio list viewable on-screen, you can enlarge the size of your console window. The Steam console window can be resized and moved much like any regular window:
To resize it, simply grab any corner of the window and drag it until it is the desired size.
To move the console, grab it by the title area (top part of the console window) and drag it around. In HL1-based games, the console will even "snap" to the edges of the screen for you.
It might be especially helpful to adjust the width of the console until each file name in the audio list fits onto its own line.

For convenience, you can bind a key to bring up the console and the audio list at the same time: you can place the above line into your hldj_custom.cfg file.