Customise existing Mp3 player, easy bulk import/export Mp3 player tracks, easy bulk upload for individual mp3 purchase. and minor bug fixes

Hi we currently have an mp3 audio player on our opencart store: [login to view URL] We need help with the following: 1. We need the ability for us to easily customise the players font style, font size, all text (including current "Audios to Buy" above the player) and ALL colours for the player including text and player boxes and buy buttons. 2. An easy bulk upload for the mp3s for the audio player and import/export for the track listing. 3. An easy bulk upload and import/export for individual song downloads. Ideally the bulk import/export for the audio player and individual song downloads to all be on one spreadsheet page. See attached example "Assign files on one sheet". 4. Ability to toggle wether the audio player is above or below the whole album download buy details (eg songs 3 & 4 on the example link above). 5. Spotify stream button or widget which we can toggle on/off for each page. 6. To have the ability to sort products by date. And to chose to set that as the default. See attached "Sort by date" file. 7. Fix check out bug. Whenever you go to check out from the cart you can not progress when you get to the payment details unless you refresh the page. Please see attached check "Out bug - refresh" file. Many thanks