snd_play on key press?

var video_mode= 8;
var video_screen= 1;
var video_depth= 32;

var walk_speed;
var breath_speed;
var jump_speed;

string anim_wmb= <JumpDude.wmb>;

string keys_str= "Use the arrow keys to move around.";
string keys2_str= "Press the J key to jump.";
string keys3_str= "Press I to see these instructions again.";

sound jump_snd= <smb_jumpsmall.wav>;

bmap intro_pcx= "jdudeintro.pcx";

function main()
{
	level_load (anim_wmb);
	wait(3);
	camera.x= -48;
	camera.y= 334;
	camera.z= 149;
	camera.pan= 281;
	camera.tilt= -48;
	camera.roll= 0;
	pan_fade();
	txt_show();
	show_again();
	on_j= smb_jump;
}

action char_walk
{
	my.fat= on;
	my.narrow= on;
	c_setminmax(my);
	while(1)
	{
		if(key_cuu== on)
		{
			c_move(my,vector(0,6 * time_step,0),nullvector,glide);
			ent_animate(my,"walk",walk_speed,anm_cycle);
			walk_speed+= 7 * time_step;
		}
		else
		{
			ent_animate(my,"stand",breath_speed,anm_cycle);
			breath_speed+= 3 * time_step;
		}
		if(key_cud== on)
		{
			c_move(my,vector(0,-6 * time_step,0),nullvector,glide);
			ent_animate(my,"walk",walk_speed,anm_cycle);
			walk_speed+= -7 * time_step;
		}
		if(key_cul== on)
		{
			my.pan+= 10 * time_step;
		}
		if(key_cur== on)
		{
			my.pan-= 10 * time_step;
		}
		if(key_j== on)
		{
			c_move(my,vector(0,0,15 * time_step),nullvector,glide);
			ent_animate(my,"jump",jump_speed,anm_cycle);
			jump_speed+= 14 * time_step;
		}
		else
		{
			c_move(my,vector(0,0,-15 * time_step),nullvector,glide);
		}
		wait(1);
	}
}

panel intro
{
	pos_x= 0;
	pos_y= 0;
	bmap= intro_pcx;
	flags= transparent, overlay, visible;
	alpha= 100;
}

font big_fnt= "Times New Roman",1,20;

text keys_txt
{
	pos_x= 384;
	pos_y= 550;
	font= big_fnt;
	string= keys_str;
}

function pan_fade()
{
	wait(-2);
	while(1)
	{
		intro.alpha-= 3 * time_step;
		wait(1);
	}
}

function txt_show()
{
	wait(-3);
	keys_txt.visible= on;
	wait(-3);
	keys_txt.string= keys2_str;
	wait(-3);
	keys_txt.string= keys3_str;
	wait(-3);
	keys_txt.visible= off;
}

function show_again()
{
	while(1)
	{
		if(key_i== on)
		{
		keys_txt.visible= on;
		wait(1);
		keys_txt.string= keys_str;
		wait(-3);
		keys_txt.string= keys2_str;
		wait(-3);
		keys_txt.string= keys3_str;
		wait(-3);
		keys_txt.visible= off;
		}
		wait(1);
	}
}

function smb_jump()
{
	snd_play(jump_snd,100,0);
}