If you use usbsoftrock you maybe want a simple but more comfortable interface to change frequencies. This small cs ript gives a little bit more comfort than the commandline. Note the multiplier for usbsoftrock is 4 - you have to change it in the script manually or fork the script and implement a commandline parameter ;) The same applies for the frequency hop value - its 44.1 khz - if you need a greater value you have to change it.
Manual: after startup you can use the arrow up and the arrow down key to change the frequency by the hop value up or down.
If you write a number like 3.5 and hit enter the frequency is directly changed to this value.
q exits the tool.
Have fun