Maybe your 9 album tracks are not properly recognized by the Music database software of the Clip Sport ?
Maybe check the ID3 tags. The Clip Sport does best reading ID3 tags in format ID3v2.3 ISO-8859-1.
ALSO, the Clip Sport music database does best when the first 24 characters of your album title and the first 12 characters of your song titles have unique specificity.
Maybe try using Folder mode to play these 9 tracks.
Folder Mode is identified in the Clip Sport user manual with one brief statement (on page 5)
"Browse and listen to content saved in individual folders."
Folder Mode is most useful for direct access to audio files that do not have functional metadata in the ID3 tags.
The Clip Sport uses Music mode to access internal audio files and Card mode to access external audio files that have appropriate ID3 tag data.
Folder Mode is also useful for direct access to all audio files saved on micro SD cards with greater than 16 gb capacity.
For all Clip Sport Firmware (except beta 1.28), the Music database capacity for the micro SD card is limited to 2000 files.
Additional audio files are not logged into the Music database. These files can still be accessed via Folder mode.
My personal preference is to make the effort to properly curate my ID3 tag data. Then I can take advantage of the Music and Card mode playback features. I also use Beta Firmware 1.28. This firmware allows for 4000 audio files per Music database. Unfortunately it has a reduced number of characters (60%) allowed for proper sorting of audio files.
For the past several years I have experienced excellent results curating ID3 tag data in my mp3 audio files using the software “mp3tag”. Here is a link to the main website. The software has an amazing array of tools for editing tags and filenames.
I experience best results with my Clip Sport using ID3 format v2.3
Under Tools -> Options -> Tags -> Mpeg, select Write to ID3v2.3 ISO-8859-1.
Also, I try to make sure the first 8-12 characters of the album, artist and song title fields have the most unique information.
PS: My continuing learning how to enjoy my Clip Sport players comes from reading contributions to the SanDisk forum and from searching topics via Google. The CS user manual is really a minimal starting point.
Even though I am a satisfied user of my Clip Sport, I am not a big fan of bluetooth head phones. I have not tried the Clip Sport Plus. I do not mind clipping my favorite audio player onto my shirt collar or jacket pocket with about 6 inches of cable providing battery-free and connection problem-free listening pleasure.
I was hoping a satisfied CS Plus user would start a new message topic on the SanDisk Forum with a list of bleutooth connection sucess stories?? For example, what about streaming to the Amazon Echo? That would be a big selling lure for me.
I have not tried the Clip Sport Plus, since I am not a big fan of bluetooth earbuds & headphones. Too many connection and battery drain problems for me.
I am hoping a satisfied Clip Sport Plus user will start a new message topic on the SanDisk Forum with a list of bluetooth connection success stories?? For example, what about streaming to the Amazon Echo? And maybe SanDisk could sell a version that includes access for a micro SD card ??