Yes it is possible to use a Monthly voice track system. Your categories would represent every day of the month from 01 to 31. Station numbers would be represented by Alphabetic characters A to Z. So, you would need to create categories 01A-31A for your first station, and then 01B-31B for your second station. In Merge32, under System, Configure Conversions, under Voice Track options, you need to ensure that Weekly Voice Track Categories is not checked. Under Append to Voice Track Cat, you would place the letter for the correct station: A-Z.