Sierra Summit/Ascent EMG audio is normally heard from the base unit speakers.  When EMG audio is not heard from the base unit speakers, there are a few corrective actions to take.

First, verify that the audio mute checkbox at the top of the EMG recording screen is not checked.  Pressing the Volume Knob will also un-mute the audio.
Next, check the Sierra Summit/Ascent software version in the help/about menu.  If it is Sierra software is version 1.0 then update to a higher version.  For Sierra/Ascent versions 1.1 and higher, follow these steps:

Summit Settings:

1. Launch the Sierra Summit/Ascent
2. Click on Edit, then System Setup
3. Click on the Audio Setup button
4. Set the EMG Audio Device (Live and Playback) to “Summit Speakers (USB Audio CODEC)”
5. Click the OK button to close the Audio Setup window
6. Click OK again to close the System Setup window
7. Close the Sierra Summit/Ascent program
8. Open Summit/Ascent to see if EMG audio is working properly

Windows Audio Settings:

1. Click on the Windows speaker icon located in the taskbar next to the Windows time
2. Click on Mixer
3. Click on the speaker selection pull down arrow then Select “Summit Speakers (USB AudioCodec)”
4. Verify that the speaker is not muted as indicated by a red symbol over the speaker.  Click on the speaker symbol to un-mute it
5. Turn volume adjustment to a higher position if it is set to zero or very low
6. Open Summit/Ascent to see if EMG audio is working properly

Summit/Ascent Speaker Driver Verification:

1. Close Sierra Summit/Ascent program
2. Click Windows Start (Windows 7)
3. Enter/type in Device Manager in the search box (Windows 7 and 10)
4. Click on Device Manager from listed results
5. Expand Sound, Video and Game Controller list
6. Look for USB Audio Codec and note if an exclamation error symbol appears
7. If error symbol is present, right click on USB Audio Codec
8. Select Update Driver Software
9. Select Let me pick from a list of devices on my computer
10. Select USB Audio Device
11. Click on Next
12. Close
13. Recheck status –   error symbol should be gone
14. Close Device Manager window
15. Open Summit/Ascent to see if EMG audio is working properly