For the most part, MSeed mass-position channels have the format VM\[0-9\] (we will use regex for the format from here on). However, for Q330 data sets only, mass-position channels can also have the format VM\[ZNEUVW\]. Because VM\[0-9\] looks to be a widely-used standard, it is srecognized as mass-position by default. To avoid the problem where a datalogger uses VM\[A-Z\] for non-mass-position channels, however, we only recognizes VM\[ZNEUVW\] as mass-position if the data type is Q330. In order to add support for dataloggers that use any format other than VM\[0-9\] for their mass-position channels, the developer has to add the check explicitly in the code. This can be done in `sohstationviewer.database.extract_data.convert_actual_channel_to_db_channel_w_question_mark()`.
