suspend fun download(url: String) = withContext(Dispatchers.IO) {
    val progress = Channel<Int>(UNLIMITED)

    launch {
        while (true) {
            //read bytes
            progress.send(percent)
        }
        progress.close()
    }

    return progress
}

fun downloadAudio(url: String) = launch {
    vs.showDownloadProgress()

    val progress = download(url, progress)

    for (percent in progress) {
        vs.progress(percent)
    }

    vs.hideDownloadProgress()
}