*NextZXOS and alternatives*), written by David Saphier and Kev Brady, that can be incorporated into your programs and which not only allow you to play any **WAV** file stored on *SD Card* media but also a plethora of digital audio formats. Currently via *NextZXOS* you can play natively (you'll see why we explicitly mention it in a second) the following audio file types: ### WAV This is the standard audio format for most computers. The ZX Spectrum Next supports audio resolutions up to 32KHz. In order to playback a digital audio wave file, type: ``` .wavplay32 file.wav ``` where **file.wav** is the audio file you want to play. This can be accessed (like all other *NextZXOS dot commands*) from the 48K BASIC environment as well and fully incorporated into all your *NextBASIC* programs. You can find more information on how to access the digital audio hardware of your ZX Spectrum Next in *Chapter 22 – IN, OUT and the Next Registers* . ### MOD MODule files are one of the major standards for computer music and they comes from the Amiga and its ProTracker application. There are two ways you can play MOD files on the Next. You either use the dot command **.nxmod** with your selection of **.mod** file as an argument; for example: ``` .nxmod song2.mod ``` or you can use the native application **NXModPlayer**. This can be found under **c:/apps/audio/NxModPlay/** accessible either via the Browser (See relevant section on the Browser in the next Chapter) or via the commands: ``` a$ = "c:/apps/audio/NxMod/nxmod play.nex" .nexload a$ ``` ### PT3 PT3 is one of the de-facto standards for AY chip music, and the ZX Spectrum Next supports playback of up to 6 channel audio in two ways. First is via the dot command **.playpt3** with the pt3 filename as an argument: ``` .playpt3 onlyyou.pt3 ``` or via the application NextSID. This is a rather special application as it not only allows you to play back pt3 music files but also to apply SID-like effects to the channels. NextSID can be found under **c:/apps/audio/NextSID**. As with NXModPlayer above you can either start it via the Browser or via the commands: ``` a$="c:/apps/audio/NextSID/nextsid.nex" .nexload a$ ``` Note that you will need a mouse installed. ### Using the Pi accelerator for audio If you have the *Accelerated* version of the ZX Spectrum Next, or have a *Raspberry Pi Zero* installed on your board, then you have more options available audio-wise. These include (but are not limited to) playback of: - Commodore 64 SID files - "Tracker" MOD files