# Add and play audio files > Upload MP3, WAV, M4A or AIFF files like any other asset; each one shows a waveform you can play, scrub, zoom into with Cmd or Ctrl and scroll, comment on at a moment or a range, and open in focus mode. Category: Adding content Web page: https://www.pactto.com/help/audio-files All guides: https://www.pactto.com/help.md ## Add an audio file Add audio the same way as any other file: **Add asset** (or press **1**), drag and drop onto the canvas or a board, or paste. Pactto accepts MP3, WAV, M4A and AIFF (.aiff or .aif) files, up to the same size limit as other files. You need **Can edit** access or to be the room owner. While it uploads, the audio item shows **Uploading…** with a percentage. Once the upload finishes, Pactto draws the waveform. Until then, a simple progress bar shows in its place. ## Play it - Click the play button in the middle of the waveform, or select the audio and press **Space**. - Click anywhere on the waveform to jump to that moment. Hover over it to see the time under the pointer. - Select the audio to show the scrub bar and controls below it: play or pause, **Playback speed**, the volume button and the time. Drag the scrub bar to move through the file. - Click **Playback speed** to cycle through 1x, 1.25x, 1.5x, 2x, 0.5x and 0.75x. - Hover over the volume button to show the volume bar. Click it to mute or unmute. Times show as minutes and seconds (for example 1:05), or hours, minutes and seconds past one hour. ## Zoom into the waveform 1. Hold **Cmd** (Mac) or **Ctrl** (Windows) and scroll over the waveform, or pinch on a trackpad. The waveform zooms around the pointer, up to 64 times. 2. To move along a zoomed waveform, scroll sideways, hold **Shift** and scroll, or drag the highlighted part of the scrub bar. While it plays, the zoomed view follows the playhead. The zoom is only on your screen, and it resets when you reload the page. ## Comment on a moment or a range 1. Select the audio and pick the **Comment** tool (**K**). 2. Click the audio to comment at the current time, or click a spot on the waveform to comment at that moment. 3. To comment on a range, drag across the waveform or the comment row below the scrub bar. The hint **Drag to create a range** shows where to drag. 4. Write your comment and post it. Comments show as avatars in a row under the scrub bar at their time, with a line across the waveform. Click an avatar to open the comment and move the audio to that moment. Comments on audio do not get a pin on the canvas. In the Comments panel they are grouped under audio. See [Comment on a video frame, a video range, or a PDF page](https://www.pactto.com/help/comments-video-pdf.md) for how timed comments work. ## Focus, present and share - Click **Enter focus mode** in the audio's title bar to show it full width. See [Focus on one item or board](https://www.pactto.com/help/focus-mode.md). - An audio file inside a board is a slide when you present the board. See [Present in a room](https://www.pactto.com/help/present.md). - If you are the spotlight, play, pause and jumps are shared with the people following you, the same as for videos. See [Play videos and keep them in sync for everyone](https://www.pactto.com/help/video-playback.md). - The title bar also has **Download** (the original file) and the review status. ## If something goes wrong - "Audio is still processing.": an AIFF file is being prepared for playback. Wait a moment. You can still download it. - "This audio can't be played.": Pactto could not prepare the file for playback in the browser. Download it to listen, or upload it again in another format such as WAV or MP3. - "Supported types: Videos, images, PDFs, audio": the file is in a format Pactto does not take, such as OGG or FLAC. Convert it to MP3, WAV, M4A or AIFF. ## Good to know - You cannot attach audio files to comments or send them to the AI Assistant. ## Related guides - [Add images, videos, audio, PDFs, and other content to a room](https://www.pactto.com/help/add-assets.md): Click Add asset in the toolbar (or press 1) to upload from your computer, Google Drive, or Adobe Frame.io; you can also drag files onto the canvas, paste them, paste links, or create a Pactto doc or a table. - [Which file types can I upload, and how large can they be?](https://www.pactto.com/help/supported-file-types.md): You can upload videos, images, PDFs, and audio files (MP3, WAV, M4A, AIFF); each file can be up to 5 GB, or less if your plan sets a lower per-file limit. - [Comment on a video frame, a video range, or a PDF page](https://www.pactto.com/help/comments-video-pdf.md): With the Comment tool on, click a video's frame or timeline for a frame comment, drag along the timeline for a time range, or click a PDF to comment on the page you are viewing. - [Play videos and keep them in sync for everyone](https://www.pactto.com/help/video-playback.md): Click the round play button on a video or select it to use the controls (timeline, Play, speed, volume, time format); during Spotlight, play, pause and seeking are shared by everyone in the session. - [Focus on one item or board](https://www.pactto.com/help/focus-mode.md): Select an item or board and click Enter focus mode (or double-click an image or PDF) to show only that item, full size; press Escape or click Exit focus mode to go back to the canvas. - [Present in a room](https://www.pactto.com/help/present.md): Add your assets, put them in a board, select the board and click the play button (Enter presentation mode), or right-click an item in the board and choose Present from here; turn on Spotlight so everyone in the room follows your slides. - [See an item's details in the Info panel](https://www.pactto.com/help/asset-info.md): In focus mode, click Info at the top left (or press I) to open the Info panel with the item's name, file details, who uploaded or generated it, and a description; click the name to rename it. - [Find and manage files in the Assets panel](https://www.pactto.com/help/assets-panel.md): Click Assets on the left edge of the room to list every image, video, audio file, PDF, link, doc and table on the canvas, grouped by board; search, filter, jump to a file, rename it for the whole room, or add another copy to the canvas.