@client.command(pass_context=True, aliases=['j'])
async def join(ctx):
    global voice
    channel = ctx.message.author.voice.channel
    voice = get(client.voice_clients, guild=ctx.guild)

    if voice and voice.is_connected():
        await voice.move_to(channel)
        print(voice)
    else:
        await ctx.message.channel.send(f'Joined {channel}')
        voice = await channel.connect()

@client.command(pass_context=True, aliases=['l'])
async def leave(ctx):
    global voice

    channel = ctx.message.author.voice.channel

    print(voice)
    voice = get(client.voice_clients, guild=ctx.guild)

    if voice and voice.is_connected():
        await voice.disconnect()
    else:
        await ctx.message.channel.send("I'm not in a voice channel")
        print(voice)