"We're willing to try new things and we want to see what happens," said keyboardist Mark Kelly.
"Everybody's aware of the effect of peer-to-peer file-sharing on CD sales and the music industry in general," he added.
"Up until recently we've felt fairly immune to that because the fans have been really supportive of the band and, I suppose, because of the age demographic, they do tend to prefer CDs to downloads."
Just like Radiohead before them, they plan to release the CD as well, on October 20th.
"People forget Radiohead were still number one in the album charts," he added.
"They also say they weren't very successful because they only got an average of £2 per download.
"But they wouldn't have got £2 per sale from [record company] EMI, so in those terms it was actually a big success, and they still sold CDs."